| Age | Commit message (Collapse) | Author |
|---|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull more MM updates from Andrew Morton:
- "mm: make VMA flag semantics explicit, eliminate VM_SPECIAL" (Lorenzo
Stoakes):
Replace VM_SPECIAL with helpers describing mapping ownership and
behavior. Enforce the mmap flag rules and convert affected drivers,
removing ambiguous tests shared by driver mappings and ordinary
memory.
- "support kselftest on nommu platform" (Hajime Tazaki):
Add opt-in mmap and mremap tests for NOMMU systems. Teach the runner
to avoid its fork-dependent timeout command and document the build
and runtime requirements.
- "mm/collapse: separate a collapse from its callers" (Kiryl
Shutsemau):
Separate huge-page collapse from caller policy. Replace khugepaged
identity checks with explicit permissions, and separate scanning from
collapse with the mmap_lock drop in one place.
- "mm: implement and use vma_has_anon_rmap(), silence KCSAN" (Lorenzo
Stoakes):
Provide a common helper for testing whether a VMA has anonymous
reverse mappings. Document the locking rules, annotate intentional
concurrent reads for KCSAN, and convert the core MM callers.
- "mm/sparse: remove SECTION_MARKED_PRESENT and further cleanups"
(David Hildenbrand):
Remove SECTION_MARKED_PRESENT in favor of the early-section flag.
Simplify sparse memory initialization, section metadata handling and
related PFN validity checks.
- "sh: remove NUMA and SPARSEMEM support" (Mike Rapoport):
Remove SuperH NUMA and SPARSEMEM support. The extra memory banks have
been unusable since the NO_BOOTMEM conversion, leaving only the code
and data overhead.
- "mm: Unify device DAX and HugeTLB vmemmap population paths" (Muchun
Song):
Unify the generic device DAX and HugeTLB vmemmap population paths and
shared tail-page handling. Remove the duplicate DAX machinery while
retaining the powerpc radix implementation.
- "kselftest: mm: fix some failure of split_huge_page_test" (Yeoreum
Yun):
Fix huge-page split tests racing with khugepaged recollapse. Use
pagemap and page flags instead of VMA-boundary assumptions which fail
when glibc has already enabled THP.
- "memcg: move memcgid refcount to objcg to unpin dying memcgs"
(Bingfang Guo):
Let dying memcgs be freed while swapped-out shmem still holds their
IDs. Move ID references to reparentable objcgs, with the necessary
swap accounting and RCU lifetime changes.
- "mm/truncate: fix data loss when truncating straddling large folios"
(Zhang Yi):
Preserve out-of-range data when truncating straddling large folios.
Fix a lookup race and split-failure handling, and handle minimum
folio orders for the forthcoming ext4 iomap buffered I/O path.
- "mm/damon: introduce damos quota goal target metric complement flag"
(SJ Park):
Let DAMOS quota goals use a metric's complement, so utilization can
also express free-memory goals without adding separate metrics. Add
the sysfs interface, documentation and tests.
- "arm64/mm: Standardize printing for pgtable entries" (Anshuman
Khandual):
Use the generic formatter for arm64 page-table entries, ready for
future wider entries. Move the safe-PTE-update check out of the
header to avoid an include cycle.
- "mm: kmsan: fix iounmap metadata teardown" (Dima Koziuk):
Fix KMSAN metadata leaks on iounmap and failed ioremap allocations.
Free backing pages before removing their mappings, and share the
teardown with partial-allocation cleanup.
- "mm/damon/core: preserve quota state when constructing schemes" (Karl
Mehltretter):
Preserve running DAMOS quota state while validating parameter
updates. Even rejected updates could reset accounting and exceed the
quota window; add tests for both accepted and rejected updates.
- "mm/vmalloc: fix vmalloc_dump_obj VA lookup" (Ye Liu):
Fix vmalloc_dump_obj() lookups for last-page addresses and
allocations spanning vmap zones. These allocations were being missed
in diagnostic output.
- "mm: various (urgent?) fixes" (David Hildenbrand):
Fix mmap charge leaks and hugetlb use-after-free, wrong-address
unmapping, stuck locks and endless faults. Also preserve reservations
on failed mremap and handle stale userfaultfd bits.
- "maple_tree: fix maple_range_64 crashes in RCU mode" (Dimitris
Charisis):
Fix pointer and metadata confusion during RCU destruction of
maple_range_64 nodes, avoiding double frees and invalid accesses. Add
a regression test; no in-tree user currently uses this combination.
- "mm: fix hugetlb NR_HUGETLB accounting on folio migration" (Hongfu
Li):
Fix hugetlb migration and preallocation accounting so /proc/vmstat
retains the correct count and memory.numa_stat follows the folio to
its new node.
- "mm/damon: fix a minor bug, clean code, and add a test" (SJ Park):
Fix 32-bit DAMON age overflow which made old regions look young.
Share hugetlb folio acquisition code and add a regression test for
the previously fixed last-region skipping bug.
- "mm/damon/core: cleanup code, reduce stack usage, and add kunit" (SJ
Park):
Reduce kdamond stack usage and remove unused enums. Add deterministic
PSI quota-goal tests which do not depend on the machine's current
memory pressure.
- "mm/damon: fix the temporal goal tuner's size quota conversion"
(Donggeun Yoo):
Bound the temporal tuner's quota conversion to prevent overflow and
zero effective quotas, which could stop schemes making progress. Add
boundary tests.
- "Don't use GFP_DMA when calling dma_alloc_coherent" (Baoquan He):
Remove redundant GFP_DMA flags from coherent DMA allocation calls.
The DMA API already selects the zone from device limits and ignores
the caller's flag.
- "kselftest: mm: fix intermittent failure khugepaged test" (Yeoreum
Yun):
Propagate child-process failures in the khugepaged tests and prevent
background collapse from racing their checks. This removes false
passes and intermittent failures.
- "MAINTAINERS: cover all hugetlb headers under HUGETLB SUBSYSTEM"
(Enze Li):
Cover all hugetlb headers in MAINTAINERS so get_maintainer.pl finds
the right maintainers. Also label the closing hugetlb_cgroup.h
include guard.
Summary of the 65 singletons in this merge:
The singletons include a few worthwhile performance fixes. Avoiding
unnecessary reverse-map tree updates gave a reported 15.9% improvement
in UnixBench's execl test on a 192-core x86 system. A reclaim retry
fix stops defrag_mode from spinning under memory.low protection; a
reported file-creation stress test ran 5.7 times faster, with far less
memory pressure. Narrower hugetlb invalidations also spare KVM guests
needless refaults: the reported Redis-in-VM P99 QPS penalty while
punching holes fell from 7.09% to 1.45%.
Several fixes prevent lost data or corrupted memory. Lazyfree
huge-page races with mremap()/munmap() could lose data or access freed
memory, and MADV_COLD could lose a concurrent write's dirty bit.
Another fix prevents stale migration entries from outliving large
folios. On filesystems with blocks smaller than a page, extending a
file by 4 GiB or more could expose bytes written past the old EOF
through mmap instead of zeroes. That is fixed, along with
use-after-free races in PAGEMAP_SCAN during process exit and in
memory-cgroup accounting on PREEMPT_RT kernels.
Other fixes stop UFFDIO_MOVE spinning forever on pinned large folios,
which could wedge other memory operations, and stop mremap() leaking
commit charges until allocations fail under strict overcommit. A
further fix keeps userfaultfd tracking intact on neighboring mappings.
NUMA binding no longer prevents long-term pins when the chosen node
has only movable memory, fixing QEMU/VFIO startup and io_uring buffer
registration failures. MGLRU also gets a fix for early-boot crashes
with memory cgroups disabled at boot, notably in small crash kernels.
* tag 'mm-stable-2026-10-25-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (213 commits)
mm: multi-gen LRU: fix NULL lruvec->pgdat deref with memcg disabled on cmdline
mm/page_counter: use WRITE_ONCE() for emin/elow when parent is the root
mm/memcontrol: publish null pointer before dropping css reference
test_maple_tree: test maple_range_64 node in RCU mode
maple_tree: fix maple_range_64 crashes in RCU mode
mm/vma: avoid broken uffd merge on mremap
tools/testing/shared: catch a failed posix_memalign()
mm/damon/core: remove unreachable damos charge_{target,addr}_from
mm/shrinker: allocate shrinker_info_unit from a dedicated kmem_cache
riscv: mm: exclude invalid THP PMDs from page table check
mm/damon/core: filter out damos address filter-split failed region
fs/proc/task_mmu: pin mm_users in do_pagemap_scan()
mm/mempolicy: apply bind policies against the scoped allocation zone
mm/vmscan: reclaim every zone in per-node proactive reclaim
mm/mremap: correctly uncharge accountable VMAs in error path
mm/mremap: populate calculated fields in vrm state correctly
MAINTAINERS: add an entry for MEMORY MANAGEMENT - MEMORY MAP
mm: bdi: reset min_ratio after the sysfs attributes are gone
mm/page_vma_mapped: continue past nonmatching huge PMDs
selftests/mm: skip hugetlb cgroup v2 tests without the needed controllers
...
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- "ocfs2: exit recovery thread on mount error path" (Joseph Qi):
Stop OCFS2 recovery before freeing failed-mount state and replay
slots, closing use-after-free and double-free races. Defer
suballocator reclaim to break a transaction-lock deadlock with
dismount.
- "ocfs2: validate suballoc slot and bit of metadata blocks" (Joseph
Qi):
Validate OCFS2 metadata suballocator slots, bits and directory index
block locations. Reject corrupt metadata with filesystem errors
instead of BUGs or out-of-bounds accesses.
- "ocfs2: deal with legacy signed name hash values" (Joseph Qi):
Restore OCFS2 lookups for non-ASCII names stored with legacy signed
hashes. Use stored xattr hashes during bucket splits to avoid
duplicate entries and spurious ENOSPC failures.
- "ocfs2: stabilize dentry names in file and setattr traces" (Cen
Zhang):
Snapshot OCFS2 names during file and setattr tracing to prevent
rename races using freed storage or mismatched names and lengths.
Preserve trace formats and the locked release open-count sample.
- "panic: fix panic_force_cpu= redirect races and NMI bypass" (Bradley
Morgan):
Fix panic_force_cpu races and NMI redirection so crash-kernel CPU
selection is honored. Preserve variable arguments on failed redirects
and use a static message buffer.
- "fat: allocate multiple clusters in fallocate" (Matheus Alves de
Almeida):
Allocate FAT clusters in batches for FALLOC_FL_KEEP_SIZE and batch
FAT updates. This removes repeated single-cluster allocation
overhead, particularly on synchronous mounts.
- "scripts/gdb: fix radix tree lookup and stack depot diagnostic"
(Ting-Han Hou):
Fix GDB radix-tree lookup and its handling of XArray sibling, retry
and zero entries. Also repair the stack-depot diagnostic for an
out-of-range pool index.
- "hung_task: Improve warning budget handling and task reporting"
(Aaron Tomlin):
Reset the hung-task warning budget after recovery so later hangs
remain visible. Keep the configured limit intact and emit one summary
per scan when detailed reports exhaust the budget.
- "bootconfig: Reject unexpected data after null character and
cleanups" (Masami Hiramatsu):
Reject bootconfig data after an embedded null while accepting
trailing padding. Validate the full input in the userspace tool, and
retain internal tree sanity checks there rather than in the kernel.
- "kbuild: GCOV cleanups following the prefer-atomic fix" (Konstantin
Khorenko):
Use the actual GCOV build flags in the prefer-atomic compiler probe.
Move flag setup into scripts/Makefile.gcov and skip the probe when
GCOV is disabled.
- "ocfs2: xattr bucket validation fixes" (Joseph Qi):
Accept valid OCFS2 xattr buckets spanning 512-byte blocks, avoiding
false read-only remounts. Reject misaligned buckets and return errors
instead of panicking on corrupt defrag metadata.
- "ocfs2: fix metadata reservation for xattr value trees" (Joseph Qi):
Reserve enough OCFS2 metadata for new and relocated xattr value
trees. Fix shortfalls which could cause ENOSPC, dropped entries and
leaked clusters on fragmented filesystems; remove duplicate
reservations.
- "Introduce arch_do_panic" (Mete Durlu):
Add arch_do_panic() and move s390 and sparc handling out of generic
panic code. The architecture-specific actions now follow the
end-of-panic marker.
- "checkpatch: userspace improvements" (Petr Vorel):
Improve checkpatch's userspace detection and suppress kernel-only
checks. Recognize standard inttypes macros and add explicit
--userspace and --no-userspace overrides.
- "ocfs2: validate dr_fs_generation of dir index root blocks" (Joseph
Qi):
Check OCFS2 directory index generations and leaf block numbers.
Reject stale or misplaced blocks instead of using metadata left by a
previously formatted filesystem.
- "selftests/membarrier: Skip an unregistered memory barrier test on
Musl" (Chris Gellermann):
Skip the unregistered membarrier test when libc has already
registered the command. Musl does this during thread creation,
causing false failures in the multithreaded test.
- "init: fix array boundary bugs in boot parameter parsing"
(Wilson Felipe Pereira):
Fix boot argument boundary cases which leave stale arguments in
init's command line or panic when replacing the final environment
variable. Clear the last slot and check duplicates before the limit.
Summary of the 87 singletons in this merge:
The OCFS2 singletons fix deadlocks between xattr updates and inline
truncation, and during inode reclaim. Corrupt quota and extent
metadata could also crash the kernel or corrupt memory; these paths
now check the layout before using it. Other fixes close use-after-free
and publication races around cluster reconfiguration, node failure,
quota remount errors and shared refcount trees. New files now retain
security labels from all stacked LSMs instead of silently dropping all
but one. Valid xattr insertions also stop tripping FORTIFY on builds
with counted arrays.
Elsewhere, a lost wakeup could leave hardware-monitoring reads stuck
in unkillable sleep and block further I2C traffic. That is fixed, as
are kernel memory leaks in POSIX message-queue notifications and tmpfs
casefold setup which could grow until memory is exhausted. A driver
removal race which could crash the kernel is fixed too. The
hibernation command through reboot() also stops taking the same mutex
twice, avoiding a deadlock before suspension.
On the boot side, bzip2 decoding now accepts valid full blocks emitted
by lbzip2, fixing failures to boot those compressed kernels. Malformed
bzip2 streams can no longer overflow the decode buffer, and LZ4
initrds are checked before the decoder can read past their end. FAT
rejects geometry which overflows the data-area calculation on 32-bit
systems, and rolls back entries when inode setup fails, preventing
failed creations from reappearing after remount. The x86 XOR and RAID6
AVX paths also avoid imposing a slowdown on subsequent SSE code.
* tag 'mm-nonmm-stable-2026-10-25-14-57' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (134 commits)
scripts/gdb: fix stack depot out-of-bounds diagnostic
scripts/gdb: fix radix tree lookup pointer handling
ocfs2/cluster: remove zero-address nodes from IP tree on teardown
ocfs2: snapshot the dentry name while tracing file release
ocfs2: snapshot dentry names in file and setattr traces
ocfs2/dlm: drain join handlers before releasing module text
MAINTAINERS: update Markus's e-mail address
mailmap: add entries for Andrew Jones
stackdepot: stop preallocating after the final pool
ocfs2: drain quorum work before removing the cluster
watchdog: force console verbose when reporting lockups
profiling: fix sampling step on 64-bit big-endian systems
kernel/reboot: avoid potential deadlocks during suspension
compat: avoid double rounding in times()
ocfs2: pin owning modules for open debugfs files
ocfs2/cluster: initialize heartbeat regions before publishing them
selftests/proc: proc-pid-vm: fix unused variable warning on non-x86
ocfs2: pin refcount trees before dropping the lookup lock
ocfs2: validate the xattr tree root of an indexed xattr block
ocfs2/dlm: hold the lookup reference across convert AST enqueue
...
|
|
SECTION_IS_EARLY
There is no reason to handle the absence of the corresponding BIT values.
So let's remove the fallbacks.
Link: https://lore.kernel.org/20260921-b4-sparsemem_cleanups-v2-9-54d81d65e125@kernel.org
Link: https://lore.kernel.org/r/vpz5zqg5nwbpolxbkip45vxxdt3lni7j2haal7q42skc3b57tu@uh4cec4x32dq
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Seongjun Hong <hsj0512@snu.ac.kr>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Qi Zheng <qi.zheng@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Brendan Jackman <brendan.jackman@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Danilo Krummrich <dakr@kernel.org>
|
|
The pool_index field was renamed to pool_index_plus_1, but the
out-of-bounds diagnostic in stack_depot_fetch() still accesses the old
field. Looking up a handle whose pool index is outside stack_pools
therefore raises "There is no member named pool_index" instead of printing
the diagnostic and returning an empty result.
Use the already decoded pool_index variable in the diagnostic.
Link: https://lore.kernel.org/20261011023044.1722-3-ue081723@gmail.com
Fixes: 9d938f40b228 ("scripts/gdb: rename pool_index to pool_index_plus_1")
Signed-off-by: Ting-Han Hou <ue081723@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Assisted-by: LLM
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
|
|
Patch series "scripts/gdb: fix radix tree lookup and stack depot
diagnostic", v2.
Two scripts/gdb fixes.
Patch 1 fixes $lx_radix_tree_lookup(), which dereferenced slot contents
as if they were node pointers. v2 also handles the XArray sibling,
retry and zero entries that Sashiko pointed out: they carry the
internal tag but are not node pointers, and the v1 patch raised a GDB
MemoryError on them. Large folios in the page cache make sibling
entries common, so this was worth fixing rather than documenting.
Patch 2 is unchanged from v1 apart from being resent with git
send-email, since the earlier copy was word-wrapped by the mail
client. Sorry about that.
Both patches are tested against standalone GCC-built fixtures that use
the kernel struct layouts (details below the --- line of each patch),
not against a running kernel.
This patch (of 2):
lookup() casts each slot to a pointer to a node pointer and then
dereferences it. Since the slot already contains an entry pointer,
this reads the entry's contents as another pointer instead of
returning the entry itself. Internal entries also keep their tag
bits when descending, so multi-level trees are read from the wrong
address and $lx_radix_tree_lookup() fails with a memory error.
Sibling, retry and zero entries carry the same internal tag but are
small integers rather than node pointers, so the tag alone must not
decide whether to descend. A page cache populated with large folios
has a sibling entry in every slot but the first of each folio.
Walk the tree the way xas_load() does: descend only through entries
that xa_is_node() would accept, follow sibling entries to the
canonical slot of a multi-index entry, and treat retry and zero
entries like empty slots since they hold no data. Remove the explicit
shift counter, as traversal now follows the entry type.
Link: https://lore.kernel.org/20261011023044.1722-1-ue081723@gmail.com
Link: https://lore.kernel.org/20261011023044.1722-2-ue081723@gmail.com
Fixes: b7235d6bb516 ("scripts/gdb: add a Radix Tree Parser")
Signed-off-by: Ting-Han Hou <ue081723@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Assisted-by: LLM
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
|
|
Patch series "mm: Introduce section-based vmemmap optimization for
HugeTLB", v6.
This series is split out from the earlier, larger series "mm: Generalize
HVO for HugeTLB and device DAX" [1]. While the parent series generalizes
vmemmap optimization across HugeTLB and device DAX, this subset addresses
a single, self-contained step: making the generic sparse-vmemmap code
section-based optimization aware and switching HugeTLB bootmem pages to
this path.
HugeTLB vmemmap optimization currently has its own early boot setup path.
It pre-populates optimized vmemmap mappings before the normal
sparse-vmemmap population code runs, and sparsemem carries
SPARSEMEM_VMEMMAP_PREINIT only to support that special case.
That makes the HugeTLB vmemmap optimization path harder to share with
other users of sparse-vmemmap optimization and leaves a fair amount of
HugeTLB-specific boot-time state in the generic memory initialization
flow.
This series introduces section-based vmemmap optimization support in the
sparse-vmemmap code and switches HugeTLB bootmem pages over to it.
Instead of having HugeTLB pre-populate optimized vmemmap mappings itself,
HugeTLB now records the compound page order in the corresponding memory
sections. The generic sparse-vmemmap population path can then allocate or
reuse shared tail vmemmap pages based on section metadata.
The patches are organized as follows:
- patches 1-2 prepare sparsemem and vmemmap optimization metadata
- patches 3-8 teach the common sparse-vmemmap paths to use that state
- patches 9-10 switch HugeTLB bootmem optimization to the
section-based path
- patches 11-17 clean up sparsemem and HugeTLB bootmem code that is no
longer needed after the conversion
This is intended to be the second smaller step toward the broader HVO
generalization. The device DAX conversion and the wider HVO consolidation
are left for follow-up series.
This patch (of 17):
struct mem_section is currently forced to a power-of-2 size so the
section-to-root lookup can use a mask instead of a modulo.
That requirement makes future extensions harder than necessary: adding a
small field can require configuration-dependent padding or layout checks
just to preserve the lookup scheme. Keep the lookup correct for any
struct mem_section size by using a plain modulo instead.
Do not leave the layout entirely unconstrained, though. Keep struct
mem_section double-word aligned so modest size changes, such as adding
another word-sized field on 64-bit systems, still keep a compact and
efficient layout. If future fields grow the structure beyond that sweet
spot, the lookup remains correct; only the exact layout efficiency
changes.
Link: https://lore.kernel.org/20260910063256.64386-2-songmuchun@bytedance.com
Link: https://lore.kernel.org/all/20260513130542.35604-1-songmuchun@bytedance.com/ [1]
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: David Laight <david.laight.linux@gmail.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Qi Zheng <qi.zheng@linux.dev>
|
|
The treewide rename in commit 5e0a760b4441 ("mm, treewide: rename
MAX_ORDER to MAX_PAGE_ORDER") left a few spots still using the old name:
- two comments in include/net/mana/mana.h and mm/page_alloc.c;
- the gdb helper scripts/gdb/linux/mm.py, where self.MAX_ORDER is
a local mirror of the kernel's MAX_ORDER define.
Rename the leftover instances to MAX_PAGE_ORDER so the tree is consistent.
No functional changes.
Link: https://lore.kernel.org/20260819082052.3338603-1-xiqi2@huawei.com
Signed-off-by: Qi Xi <xiqi2@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Konstantin Taranov <kotaranov@microsoft.com>
Cc: Long Li <longli@microsoft.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
|
|
last_migrate_reason
The last_migrate_reason field uses -1 as a sentinel value to mean "no
migration has happened". Replace the four bare -1 occurrences by adding a
proper MR_NEVER member to enum migrate_reason, defining a corresponding
"never_migrated" string in the MIGRATE_REASON trace macro, and updating
the GDB page_owner script to use MR_NEVER instead of the hardcoded -1 so
that lx-dump-page-owner does not incorrectly report unmigrated pages as
migrated.
No functional change.
Link: https://lore.kernel.org/20260714015117.78351-3-ye.liu@linux.dev
Signed-off-by: Ye Liu <ye.liu@linux.dev>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip
Pull NOHZ updates from Thomas Gleixner:
- Fix a long standing TOCTOU in get_cpu_sleep_time_us()
- Make the CPU offline NOHZ handling more robust by disabling NOHZ on
the outgoing CPU early instead of creating unneeded state which needs
to be undone.
- Unify idle CPU time accounting instead of having two different
accounting mechanisms. These two different mechanisms are not really
independent, but the different properties can in the worst case cause
that gloabl idle time can be observed going backwards.
- Consolidate the idle/iowait time retrieval interfaces instead of
converting back and forth between them.
- Make idle interrupt time accounting more robust. The original code
assumes that interrupt time accouting is enabled and therefore stops
elapsing idle time while an interrupt is handled in NOHZ dyntick
state. That assumption is not correct as interrupt time accounting
can be disabled at compile and runtime.
- Fix an accounting error between dyntick idle time and dyntick idle
steal time. The stolen time is not accounted and therefore idle time
becomes inaccurate. The stolen time is now accounted after the fact
as there is no way to predict the steal time upfront.
* tag 'timers-nohz-2026-06-13' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip:
sched/cputime: Handle dyntick-idle steal time correctly
sched/cputime: Handle idle irqtime gracefully
sched/cputime: Provide get_cpu_[idle|iowait]_time_us() off-case
tick/sched: Consolidate idle time fetching APIs
tick/sched: Account tickless idle cputime only when tick is stopped
tick/sched: Remove unused fields
tick/sched: Move dyntick-idle cputime accounting to cputime code
tick/sched: Remove nohz disabled special case in cputime fetch
tick/sched: Unify idle cputime accounting
s390/time: Prepare to stop elapsing in dynticks-idle
powerpc/time: Prepare to stop elapsing in dynticks-idle
sched/cputime: Correctly support generic vtime idle time
sched/cputime: Remove superfluous and error prone kcpustat_field() parameter
sched/idle: Handle offlining first in idle loop
tick/sched: Fix TOCTOU in nohz idle time fetch
|
|
gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip
Pull interrupt core updates from Thomas Gleixner:
- Rework of /proc/interrupt handling:
/proc/interrupts was subject to micro optimizations for a long time,
but most of the low hanging fruit was left on the table. This rework
addresses the major time consuming issues:
- Printing a long series of zeros one by one via a format string
instead of counting subsequent zeros and emitting a string
constant.
- Simplify and cache the conditions whether interrupts should be
printed
- Use a proper iteration over the interrupt descriptor xarray
instead of walking and testing one by one.
- Provide helper functions for the architecture code to emit the
architecture specific counters
- Convert the counter structure in x86 to an array, which
simplifies the output and add mechanisms to suppress unused
architecture interrupts, which just occupy space for nothing.
Adopt the new core mechanisms.
This adjusts the gdb scripts related to interrupt counter statistics
to work with the new mechanisms.
- Prevent a string overflow in the /proc/irq/$N/ directory name
creation code.
* tag 'irq-core-2026-06-13' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip:
x86/irq: Add missing 's' back to thermal event printout
genirq/proc: Speed up /proc/interrupts iteration
genirq/proc: Runtime size the chip name
genirq: Expose irq_find_desc_at_or_after() in core code
genirq: Add rcuref count to struct irq_desc
genirq/proc: Increase default interrupt number precision to four
genirq: Calculate precision only when required
genirq: Cache the condition for /proc/interrupts exposure
genirq/manage: Make NMI cleanup RT safe
genirq: Expose nr_irqs in core code
scripts/gdb: Update x86 interrupts to the array based storage
x86/irq: Move IOAPIC misrouted and PIC/APIC error counts into irq_stats
x86/irq: Suppress unlikely interrupt stats by default
x86/irq: Make irqstats array based
genirq/proc: Utilize irq_desc::tot_count to avoid evaluation
genirq/proc: Avoid formatting zero counts in /proc/interrupts
x86/irq: Optimize interrupts decimals printing
genirq/proc: Size interrupt directory names for 10-digit interrupt numbers
|
|
Remove fields after the dyntick-idle cputime migration to scheduler code.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Link: https://patch.msgid.link/20260508131647.43868-11-frederic@kernel.org
|
|
The chip name column in the /proc/interrupt output is 8 characters and
right aligned, which causes visual clutter due to the fixed length and the
alignment. Many interrupt chips, e.g. PCI/MSI[X] have way longer names.
Update the length when a chip is assigned to an interrupt and utilize this
information for the output. Align it left so all chip names start at the
begin of the column.
Update the GDB script as well and disentangle the header maze so it
actually works with all .config combinations.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Dmitry Ilvokhin <d@ilvokhin.com>
Link: https://patch.msgid.link/20260517194932.085786035@kernel.org
|
|
Quite some architectures have four character wide acronyms for architecture
specific interrupts like IPI, NMI, etc.
The default precision of printing the Linux device interrupt numbers is
three, which causes quite some code to play games with adding or omitting
space after the acronym and the colon in order to keep the per CPU numbers
properly aligned.
Increase the default number precision to four in the core code and get rid
of the space games all over the place. At the same time align all
architecture specific descriptor texts left so that they show up in the
same column as the interrupt chip names, which makes the output more
uniform accross architectures. Fix up the GDB script to this new scheme as
well.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260517194931.839482411@kernel.org
|
|
... to avoid function calls in the core code to retrieve the maximum number
of interrupts.
Rename it to 'total_nr_irqs' as 'nr_irqs' is too generic and fix up the
'nr_irqs' reference in the related GDB script as well.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Dmitry Ilvokhin <d@ilvokhin.com>
Reviewed-by: Radu Rendec <radu@rendec.net>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Link: https://patch.msgid.link/20260517194931.522168332@kernel.org
|
|
x86 changed the interrupt statistics from a struct with individual members
to an counter array. It also provides a corresponding info array with the
strings for prefix and description and an indicator to skip the entry.
Update the already out of sync GDB script to use the counter and the info
array, which keeps the GDB script in sync automatically.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20260517194931.442613033@kernel.org
|
|
The commit 5ba6bc27b1f9 ("slab: decouple pointer to barn from
kmem_cache_node") reorganized the struct kmem_cache to factor out the
per-node fields to the new struct kmem_cache_per_node_ptrs. This causes
the gdb scripts for lx-slabinfo and lx-slabtrace fail as they still
reference the old structure.
Adjust the gdb scripts to match the current state of struct kmem_cache.
Link: https://lore.kernel.org/20260427142448.666117-3-illia@yshyn.com
Fixes: 5ba6bc27b1f9 ("slab: decouple pointer to barn from kmem_cache_node")
Signed-off-by: Illia Ostapyshyn <illia@yshyn.com>
Acked-by: Harry Yoo (Oracle) <harry@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Hao Li <hao.li@linux.dev>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Seongjun Hong <hsj0512@snu.ac.kr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
The symbols phys_base, _text, and _end, used in x86_page_ops are either
defined in assembly or implicitly by the linker. Thus, they lack type
information and cause a conversion error after gdb.parse_and_eval.
Explicitly cast these expressions to unsigned long.
Link: https://lore.kernel.org/20260427142448.666117-2-illia@yshyn.com
Fixes: 55f8b4518d14 ("scripts/gdb: implement x86_page_ops in mm.py")
Signed-off-by: Illia Ostapyshyn <illia@yshyn.com>
Cc: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.com>
Cc: Hao Li <hao.li@linux.dev>
Cc: Harry Yoo <harry@kernel.org>
Cc: Seongjun Hong <hsj0512@snu.ac.kr>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- "pid: make sub-init creation retryable" (Oleg Nesterov)
Make creation of init in a new namespace more robust by clearing away
some historical cruft which is no longer needed. Also some
documentation fixups
- "selftests/fchmodat2: Error handling and general" (Mark Brown)
Fix and a cleanup for the fchmodat2() syscall selftest
- "lib: polynomial: Move to math/ and clean up" (Andy Shevchenko)
- "hung_task: Provide runtime reset interface for hung task detector"
(Aaron Tomlin)
Give administrators the ability to zero out
/proc/sys/kernel/hung_task_detect_count
- "tools/getdelays: use the static UAPI headers from
tools/include/uapi" (Thomas Weißschuh)
Teach getdelays to use the in-kernel UAPI headers rather than the
system-provided ones
- "watchdog/hardlockup: Improvements to hardlockup" (Mayank Rungta)
Several cleanups and fixups to the hardlockup detector code and its
documentation
- "lib/bch: fix undefined behavior from signed left-shifts" (Josh Law)
A couple of small/theoretical fixes in the bch code
- "ocfs2/dlm: fix two bugs in dlm_match_regions()" (Junrui Luo)
- "cleanup the RAID5 XOR library" (Christoph Hellwig)
A quite far-reaching cleanup to this code. I can't do better than to
quote Christoph:
"The XOR library used for the RAID5 parity is a bit of a mess right
now. The main file sits in crypto/ despite not being cryptography
and not using the crypto API, with the generic implementations
sitting in include/asm-generic and the arch implementations
sitting in an asm/ header in theory. The latter doesn't work for
many cases, so architectures often build the code directly into
the core kernel, or create another module for the architecture
code.
Change this to a single module in lib/ that also contains the
architecture optimizations, similar to the library work Eric
Biggers has done for the CRC and crypto libraries later. After
that it changes to better calling conventions that allow for
smarter architecture implementations (although none is contained
here yet), and uses static_call to avoid indirection function call
overhead"
- "lib/list_sort: Clean up list_sort() scheduling workarounds"
(Kuan-Wei Chiu)
Clean up this library code by removing a hacky thing which was added
for UBIFS, which UBIFS doesn't actually need
- "Fix bugs in extract_iter_to_sg()" (Christian Ehrhardt)
Fix a few bugs in the scatterlist code, add in-kernel tests for the
now-fixed bugs and fix a leak in the test itself
- "kdump: Enable LUKS-encrypted dump target support in ARM64 and
PowerPC" (Coiby Xu)
Enable support of the LUKS-encrypted device dump target on arm64 and
powerpc
- "ocfs2: consolidate extent list validation into block read callbacks"
(Joseph Qi)
Cleanup, simplify, and make more robust ocfs2's validation of extent
list fields (Kernel test robot loves mounting corrupted fs images!)
* tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (127 commits)
ocfs2: validate group add input before caching
ocfs2: validate bg_bits during freefrag scan
ocfs2: fix listxattr handling when the buffer is full
doc: watchdog: fix typos etc
update Sean's email address
ocfs2: use get_random_u32() where appropriate
ocfs2: split transactions in dio completion to avoid credit exhaustion
ocfs2: remove redundant l_next_free_rec check in __ocfs2_find_path()
ocfs2: validate extent block list fields during block read
ocfs2: remove empty extent list check in ocfs2_dx_dir_lookup_rec()
ocfs2: validate dx_root extent list fields during block read
ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY
ocfs2: handle invalid dinode in ocfs2_group_extend
.get_maintainer.ignore: add Askar
ocfs2: validate bg_list extent bounds in discontig groups
checkpatch: exclude forward declarations of const structs
tools/accounting: handle truncated taskstats netlink messages
taskstats: set version in TGID exit notifications
ocfs2/heartbeat: fix slot mapping rollback leaks on error paths
arm64,ppc64le/kdump: pass dm-crypt keys to kdump kernel
...
|
|
commit 581ee79a2547 ("scripts/gdb/symbols: make BPF debug info available
to GDB") added support to make BPF debug information available to GDB.
However, the argument handling loop was slightly broken, causing it to
fail if further modules were passed. Fix it to append these passed
modules to the instance variable after expansion.
Link: https://lkml.kernel.org/r/20260304110642.2020614-2-benjamin@sipsolutions.net
Fixes: 581ee79a2547 ("scripts/gdb/symbols: make BPF debug info available to GDB")
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
tk_core is a macro today which cannot be resolved by gdb.
Use the correct symbol expression to reference tk_core.
Fixes: 22c62b9a84b8 ("timekeeping: Introduce auxiliary timekeepers")
Signed-off-by: Thomas Weißschuh (Schneider Electric) <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260311-hrtimer-cleanups-v1-1-095357392669@linutronix.de
|
|
Implement all member functions of x86_page_ops strictly following the
logic of aarch64_page_ops.
This includes full support for SPARSEMEM and standard page translation
functions.
This fixes compatibility with 'lx-' commands on x86_64, preventing
AttributeErrors when using lx-pfn_to_page and others.
Link: https://lkml.kernel.org/r/20260202034241.649268-1-hsj0512@snu.ac.kr
Signed-off-by: Seongjun Hong <hsj0512@snu.ac.kr>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
One can debug BPF programs with QEMU gdbstub by setting a breakpoint on
bpf_prog_kallsyms_add(), waiting for a hit with a matching aux.name, and
then setting a breakpoint on bpf_func. This is tedious, error-prone, and
also lacks line numbers.
Automate this in a way similar to the existing support for modules in
lx-symbols.
Enumerate and monitor changes to both BPF kallsyms and JITed progs. For
each ksym, generate and compile a synthetic .s file containing the name,
code, and size. In addition, if this ksym is also a prog, and not a
trampoline, add line number information.
Ensure that this is a no-op if the kernel is built without BPF support or
if "as" is missing. In theory the "as" dependency may be dropped by
generating the synthetic .o file manually, but this is too much complexity
for too little benefit.
Now one can debug BPF progs out of the box like this:
(gdb) lx-symbols -bpf
(gdb) b bpf_prog_4e612a6a881a086b_arena_list_add
Breakpoint 2 (bpf_prog_4e612a6a881a086b_arena_list_add) pending.
# ./test_progs -t arena_list
Thread 4 hit Breakpoint 2, bpf_prog_4e612a6a881a086b_arena_list_add ()
at linux/tools/testing/selftests/bpf/progs/arena_list.c:51
51 list_head = &global_head;
(gdb) n
bpf_prog_4e612a6a881a086b_arena_list_add () at linux/tools/testing/selftests/bpf/progs/arena_list.c:53
53 for (i = zero; i < cnt && can_loop; i++) {
This also works for subprogs.
Link: https://lkml.kernel.org/r/20251106124600.86736-3-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Patch series "scripts/gdb/symbols: make BPF debug info available to GDB",
v2.
This series greatly simplifies debugging BPF progs when using QEMU gdbstub
by providing symbol names, sizes, and line numbers to GDB.
Patch 1 adds radix tree iteration, which is necessary for parsing
prog_idr. Patch 2 is the actual implementation; its description contains
some details on how to use this.
This patch (of 2):
Add a function and a command to iterate over radix tree contents.
Duplicate the C implementation in Python, but drop support for tagging.
Link: https://lkml.kernel.org/r/20251106124600.86736-1-iii@linux.ibm.com
Link: https://lkml.kernel.org/r/20251106124600.86736-2-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
The get_time() callbacks always need to match the bases clockid.
Instead of maintaining that association twice in hrtimer_bases,
use a helper.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20250821-hrtimer-cleanup-get_time-v2-8-3ae822e5bfbd@linutronix.de
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
"Significant patch series in this pull request:
- "squashfs: Remove page->mapping references" (Matthew Wilcox) gets
us closer to being able to remove page->mapping
- "relayfs: misc changes" (Jason Xing) does some maintenance and
minor feature addition work in relayfs
- "kdump: crashkernel reservation from CMA" (Jiri Bohac) switches
us from static preallocation of the kdump crashkernel's working
memory over to dynamic allocation. So the difficulty of a-priori
estimation of the second kernel's needs is removed and the first
kernel obtains extra memory
- "generalize panic_print's dump function to be used by other
kernel parts" (Feng Tang) implements some consolidation and
rationalization of the various ways in which a failing kernel
splats information at the operator
* tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (80 commits)
tools/getdelays: add backward compatibility for taskstats version
kho: add test for kexec handover
delaytop: enhance error logging and add PSI feature description
samples: Kconfig: fix spelling mistake "instancess" -> "instances"
fat: fix too many log in fat_chain_add()
scripts/spelling.txt: add notifer||notifier to spelling.txt
xen/xenbus: fix typo "notifer"
net: mvneta: fix typo "notifer"
drm/xe: fix typo "notifer"
cxl: mce: fix typo "notifer"
KVM: x86: fix typo "notifer"
MAINTAINERS: add maintainers for delaytop
ucount: use atomic_long_try_cmpxchg() in atomic_long_inc_below()
ucount: fix atomic_long_inc_below() argument type
kexec: enable CMA based contiguous allocation
stackdepot: make max number of pools boot-time configurable
lib/xxhash: remove unused functions
init/Kconfig: restore CONFIG_BROKEN help text
lib/raid6: update recov_rvv.c zero page usage
docs: update docs after introducing delaytop
...
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Alexander Gordeev:
- Standardize on the __ASSEMBLER__ macro that is provided by GCC and
Clang compilers and replace __ASSEMBLY__ with __ASSEMBLER__ in both
uapi and non-uapi headers
- Explicitly include <linux/export.h> in architecture and driver files
which contain an EXPORT_SYMBOL() and remove the include from the
files which do not contain the EXPORT_SYMBOL()
- Use the full title of "z/Architecture Principles of Operation" manual
and the name of a section where facility bits are listed
- Use -D__DISABLE_EXPORTS for files in arch/s390/boot to avoid
unnecessary slowing down of the build and confusing external kABI
tools that process symtypes data
- Print additional unrecoverable machine check information to make the
root cause analysis easier
- Move cmpxchg_user_key() handling to uaccess library code, since the
generated code is large anyway and there is no benefit if it is
inlined
- Fix a problem when cmpxchg_user_key() is executing a code with a
non-default key: if a system is IPL-ed with "LOAD NORMAL", and the
previous system used storage keys where the fetch-protection bit was
set for some pages, and the cmpxchg_user_key() is located within such
page, a protection exception happens
- Either the external call or emergency signal order is used to send an
IPI to a remote CPU. Use the external order only, since it is at
least as good and sometimes even better, than the emergency signal
- In case of an early crash the early program check handler prints more
or less random value of the last breaking event address, since it is
not initialized properly. Copy the last breaking event address from
the lowcore to pt_regs to address this
- During STP synchronization check udelay() can not be used, since the
first CPU modifies tod_clock_base and get_tod_clock_monotonic() might
return a non-monotonic time. Instead, busy-loop on other CPUs, while
the the first CPU actually handles the synchronization operation
- When debugging the early kernel boot using QEMU with the -S flag and
GDB attached, skip the decompressor and start directly in kernel
- Rename PAI Crypto event 4210 according to z16 and z17 "z/Architecture
Principles of Operation" manual
- Remove the in-kernel time steering support in favour of the new s390
PTP driver, which allows the kernel clock steered more precisely
- Remove a possible false-positive warning in pte_free_defer(), which
could be triggered in a valid case KVM guest process is initializing
* tag 's390-6.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (29 commits)
s390/mm: Remove possible false-positive warning in pte_free_defer()
s390/stp: Default to enabled
s390/stp: Remove leap second support
s390/time: Remove in-kernel time steering
s390/sclp: Use monotonic clock in sclp_sync_wait()
s390/smp: Use monotonic clock in smp_emergency_stop()
s390/time: Use monotonic clock in get_cycles()
s390/pai_crypto: Rename PAI Crypto event 4210
scripts/gdb/symbols: make lx-symbols skip the s390 decompressor
s390/boot: Introduce jump_to_kernel() function
s390/stp: Remove udelay from stp_sync_clock()
s390/early: Copy last breaking event address to pt_regs
s390/smp: Remove conditional emergency signal order code usage
s390/uaccess: Merge cmpxchg_user_key() inline assemblies
s390/uaccess: Prevent kprobes on cmpxchg_user_key() functions
s390/uaccess: Initialize code pages executed with non-default access key
s390/skey: Provide infrastructure for executing with non-default access key
s390/uaccess: Make cmpxchg_user_key() library code
s390/page: Add memory clobber to page_set_storage_key()
s390/page: Cleanup page_set_storage_key() inline assemblies
...
|
|
When one starts QEMU with the -S flag and attaches GDB, the kernel is
not yet loaded, and the current instruction is an entry point to the
decompressor. In case the intention is to debug the early kernel boot,
and not the decompressor, e.g., put a breakpoint on some kernel
function and see all the invocations, one has to skip the decompressor.
There are many ways to do this, and so far people wrote private scripts
or memorized certain command sequences.
Make it work out of the box like this:
$ gdb -ex 'target remote :6812' -ex 'source vmlinux-gdb.py' vmlinux
Remote debugging using :6812
0x0000000000010000 in ?? ()
(gdb) lx-symbols
loading vmlinux
(gdb) x/i $pc
=> 0x3ffe0100000 <startup_continue>: lghi %r2,0
Implement this by reading the address of the jump_to_kernel() function
from the lowcore, and step until DAT is turned on.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Alexander Gordeev <agordeev@linux.ibm.com>
Link: https://lore.kernel.org/r/20250625154220.75300-3-iii@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
|
|
Since these are now no longer defines, but in an enum.
Link: https://lkml.kernel.org/r/20250618134629.25700-2-johannes@sipsolutions.net
Fixes: 101f2bbab541 ("fs: convert mount flags to enum")
Reviewed-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
d_shortname of struct dentry only reserves D_NAME_INLINE_LEN characters
and contains garbage for longer names. Use d_name instead, which always
references the valid name.
Link: https://lore.kernel.org/all/20250525213709.878287-2-illia@yshyn.com/
Link: https://lkml.kernel.org/r/20250629003811.2420418-1-illia@yshyn.com
Fixes: 79300ac805b6 ("scripts/gdb: fix dentry_name() lookup")
Signed-off-by: Illia Ostapyshyn <illia@yshyn.com>
Tested-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
The per-CPU MCE interrupts are looked up by reference and need to be
de-referenced before printing, otherwise we print the addresses of the
variables instead of their contents:
MCE: 18379471554386948492 Machine check exceptions
MCP: 18379471554386948488 Machine check polls
The corrected output looks like this instead now:
MCE: 0 Machine check exceptions
MCP: 1 Machine check polls
Link: https://lkml.kernel.org/r/20250625021109.1057046-1-florian.fainelli@broadcom.com
Link: https://lkml.kernel.org/r/20250624030020.882472-1-florian.fainelli@broadcom.com
Fixes: b0969d7687a7 ("scripts/gdb: print interrupts")
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
In commit 721255b9826b ("genirq: Use a maple tree for interrupt descriptor
management"), the irq_desc_tree was replaced with a sparse_irqs tree using
a maple tree structure. Since the script looked for the irq_desc_tree
symbol which is no longer available, no interrupts would be printed and
the script output would not be useful anymore.
In addition to looking up the correct symbol (sparse_irqs), a new module
(mapletree.py) is added whose mtree_load() implementation is largely
copied after the C version and uses the same variable and intermediate
function names wherever possible to ensure that both the C and Python
version be updated in the future.
This restores the scripts' output to match that of /proc/interrupts.
Link: https://lkml.kernel.org/r/20250625021020.1056930-1-florian.fainelli@broadcom.com
Fixes: 721255b9826b ("genirq: Use a maple tree for interrupt descriptor management")
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Shanker Donthineni <sdonthineni@nvidia.com>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
The text line would not be appended to as it should have, it should have
been a '+=' but ended up being a '==', fix that.
Link: https://lkml.kernel.org/r/20250623164153.746359-1-florian.fainelli@broadcom.com
Fixes: b0969d7687a7 ("scripts/gdb: print interrupts")
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
The "d_iname" member was replaced with "d_shortname.string" in the commit
referenced in the Fixes tag. This prevented the GDB script "lx-mount"
command to properly function:
(gdb) lx-mounts
mount super_block devname pathname fstype options
0xff11000002d21180 0xff11000002d24800 rootfs / rootfs rw 0 0
0xff11000002e18a80 0xff11000003713000 /dev/root / ext4 rw,relatime 0 0
Python Exception <class 'gdb.error'>: There is no member named d_iname.
Error occurred in Python: There is no member named d_iname.
Link: https://lkml.kernel.org/r/20250619225105.320729-1-florian.fainelli@broadcom.com
Fixes: 58cf9c383c5c ("dcache: back inline names with a struct-wrapped array of unsigned long")
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jan Kara <jack@suse.cz>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- "hung_task: extend blocking task stacktrace dump to semaphore" from
Lance Yang enhances the hung task detector.
The detector presently dumps the blocking tasks's stack when it is
blocked on a mutex. Lance's series extends this to semaphores
- "nilfs2: improve sanity checks in dirty state propagation" from
Wentao Liang addresses a couple of minor flaws in nilfs2
- "scripts/gdb: Fixes related to lx_per_cpu()" from Illia Ostapyshyn
fixes a couple of issues in the gdb scripts
- "Support kdump with LUKS encryption by reusing LUKS volume keys" from
Coiby Xu addresses a usability problem with kdump.
When the dump device is LUKS-encrypted, the kdump kernel may not have
the keys to the encrypted filesystem. A full writeup of this is in
the series [0/N] cover letter
- "sysfs: add counters for lockups and stalls" from Max Kellermann adds
/sys/kernel/hardlockup_count and /sys/kernel/hardlockup_count and
/sys/kernel/rcu_stall_count
- "fork: Page operation cleanups in the fork code" from Pasha Tatashin
implements a number of code cleanups in fork.c
- "scripts/gdb/symbols: determine KASLR offset on s390 during early
boot" from Ilya Leoshkevich fixes some s390 issues in the gdb
scripts
* tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (67 commits)
llist: make llist_add_batch() a static inline
delayacct: remove redundant code and adjust indentation
squashfs: add optional full compressed block caching
crash_dump, nvme: select CONFIGFS_FS as built-in
scripts/gdb/symbols: determine KASLR offset on s390 during early boot
scripts/gdb/symbols: factor out pagination_off()
scripts/gdb/symbols: factor out get_vmlinux()
kernel/panic.c: format kernel-doc comments
mailmap: update and consolidate Casey Connolly's name and email
nilfs2: remove wbc->for_reclaim handling
fork: define a local GFP_VMAP_STACK
fork: check charging success before zeroing stack
fork: clean-up naming of vm_stack/vm_struct variables in vmap stacks code
fork: clean-up ifdef logic around stack allocation
kernel/rcu/tree_stall: add /sys/kernel/rcu_stall_count
kernel/watchdog: add /sys/kernel/{hard,soft}lockup_count
x86/crash: make the page that stores the dm crypt keys inaccessible
x86/crash: pass dm crypt keys to kdump kernel
Revert "x86/mm: Remove unused __set_memory_prot()"
crash_dump: retrieve dm crypt keys in kdump kernel
...
|
|
Using lx-symbols during s390 early boot fails with:
Error occurred in Python: 'utf-8' codec can't decode byte 0xcb in position 0: invalid continuation byte
The reason is that s390 decompressor's startup_kernel() does not create
vmcoreinfo note, and sets vmcore_info to kernel's physical base. This
confuses get_vmcore_s390().
Fix by handling this special case. Extract vm_layout.kaslr_offset from
the kernel image in physical memory, which is placed there by the
decompressor using the __bootdata_preserved mechanism, and generate a
synthetic vmcoreinfo note from it.
Link: https://lkml.kernel.org/r/20250515155811.114392-4-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Move the code that turns off pagination into a separate function. It will
be useful later in order to prevent hangs when loading symbols for kernel
image in physical memory during s390 early boot.
Link: https://lkml.kernel.org/r/20250515155811.114392-3-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Patch series "scripts/gdb/symbols: determine KASLR offset on s390 during
early boot".
I noticed that debugging s390 early boot using the support I introduced in
commit 28939c3e9925 ("scripts/gdb/symbols: determine KASLR offset on
s390") does not work.
The reason is that decompressor does not provide the vmcoreinfo note, so
KASLR offset needs to be extracted in a different way, which this series
implements. Patches 1-2 are trivial refactorings, and patch 3 is the
implementation.
This patch (of 3):
Move the code that determines the current vmlinux file into a separate
function. It will be useful later in order to analyze the kernel image in
physical memory during s390 early boot.
Link: https://lkml.kernel.org/r/20250515155811.114392-1-iii@linux.ibm.com
Link: https://lkml.kernel.org/r/20250515155811.114392-2-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Dynamic memory layout is used by KASLR and 5-level paging.
CONFIG_X86_5LEVEL is going to be removed, making 5-level paging support
unconditional which requires unconditional support of dynamic memory
layout.
Remove CONFIG_DYNAMIC_MEMORY_LAYOUT.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250516123306.3812286-2-kirill.shutemov@linux.intel.com
|
|
Commit db08c53fdd542bb7f83b ("scripts/gdb: fix parameter handling in
$lx_per_cpu") changed the parameter handling of lx_per_cpu to use GdbValue
instead of parsing the variable name. Update the documentation to reflect
the new lx_per_cpu usage. Update the hrtimer_bases example to use rb_tree
instead of the timerqueue_head.next pointer removed in commit
511885d7061eda3eb1fa ("lib/timerqueue: Rely on rbtree semantics for next
timer").
Link: https://lkml.kernel.org/r/20250503123234.2407184-3-illia@yshyn.com
Signed-off-by: Illia Ostapyshyn <illia@yshyn.com>
Cc: Alex Shi <alexs@kernel.org>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Dongliang Mu <dzm91@hust.edu.cn>
Cc: Florian Rommel <mail@florommel.de>
Cc: Hu Haowen <2023002089@link.tyut.edu.cn>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Patch series "scripts/gdb: Fixes related to lx_per_cpu()".
These patches (1) fix kgdb detection on systems featuring a single CPU and
(2) update the documentation to reflect the current usage of lx_per_cpu()
and update an outdated example of its usage.
This patch (of 2):
When requested the list of threads via qfThreadInfo, gdb_cmd_query in
kernel/debug/gdbstub.c first returns "shadow" threads for CPUs followed by
the actual tasks in the system. Extended qThreadExtraInfo queries yield
"shadowCPU%d" as the name for the CPU core threads.
This behavior is used by get_gdbserver_type() to probe for KGDB by
matching the name for the thread 2 against "shadowCPU". This breaks down
on single-core systems, where thread 2 is the first nonshadow thread.
Request the name for thread 1 instead.
As GDB assigns thread IDs in the order of their appearance, it is safe to
assume shadowCPU0 at ID 1 as long as CPU0 is not hotplugged.
Before:
(gdb) info threads
Id Target Id Frame
1 Thread 4294967294 (shadowCPU0) kgdb_breakpoint ()
* 2 Thread 1 (swapper/0) kgdb_breakpoint ()
3 Thread 2 (kthreadd) 0x0000000000000000 in ?? ()
...
(gdb) p $lx_current().comm
Sorry, obtaining the current CPU is not yet supported with this gdb server.
After:
(gdb) info threads
Id Target Id Frame
1 Thread 4294967294 (shadowCPU0) kgdb_breakpoint ()
* 2 Thread 1 (swapper/0) kgdb_breakpoint ()
3 Thread 2 (kthreadd) 0x0000000000000000 in ?? ()
...
(gdb) p $lx_current().comm
$1 = "swapper/0\000\000\000\000\000\000"
Link: https://lkml.kernel.org/r/20250503123234.2407184-1-illia@yshyn.com
Link: https://lkml.kernel.org/r/20250503123234.2407184-2-illia@yshyn.com
Signed-off-by: Illia Ostapyshyn <illia@yshyn.com>
Cc: Alex Shi <alexs@kernel.org>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Dongliang Mu <dzm91@hust.edu.cn>
Cc: Florian Rommel <mail@florommel.de>
Cc: Hu Haowen <2023002089@link.tyut.edu.cn>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- The series "powerpc/crash: use generic crashkernel reservation" from
Sourabh Jain changes powerpc's kexec code to use more of the generic
layers.
- The series "get_maintainer: report subsystem status separately" from
Vlastimil Babka makes some long-requested improvements to the
get_maintainer output.
- The series "ucount: Simplify refcounting with rcuref_t" from
Sebastian Siewior cleans up and optimizing the refcounting in the
ucount code.
- The series "reboot: support runtime configuration of emergency
hw_protection action" from Ahmad Fatoum improves the ability for a
driver to perform an emergency system shutdown or reboot.
- The series "Converge on using secs_to_jiffies() part two" from Easwar
Hariharan performs further migrations from msecs_to_jiffies() to
secs_to_jiffies().
- The series "lib/interval_tree: add some test cases and cleanup" from
Wei Yang permits more userspace testing of kernel library code, adds
some more tests and performs some cleanups.
- The series "hung_task: Dump the blocking task stacktrace" from Masami
Hiramatsu arranges for the hung_task detector to dump the stack of
the blocking task and not just that of the blocked task.
- The series "resource: Split and use DEFINE_RES*() macros" from Andy
Shevchenko provides some cleanups to the resource definition macros.
- Plus the usual shower of singleton patches - please see the
individual changelogs for details.
* tag 'mm-nonmm-stable-2025-03-30-18-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (77 commits)
mailmap: consolidate email addresses of Alexander Sverdlin
fs/procfs: fix the comment above proc_pid_wchan()
relay: use kasprintf() instead of fixed buffer formatting
resource: replace open coded variant of DEFINE_RES()
resource: replace open coded variants of DEFINE_RES_*_NAMED()
resource: replace open coded variant of DEFINE_RES_NAMED_DESC()
resource: split DEFINE_RES_NAMED_DESC() out of DEFINE_RES_NAMED()
samples: add hung_task detector mutex blocking sample
hung_task: show the blocker task if the task is hung on mutex
kexec_core: accept unaccepted kexec segments' destination addresses
watchdog/perf: optimize bytes copied and remove manual NUL-termination
lib/interval_tree: fix the comment of interval_tree_span_iter_next_gap()
lib/interval_tree: skip the check before go to the right subtree
lib/interval_tree: add test case for span iteration
lib/interval_tree: add test case for interval_tree_iter_xxx() helpers
lib/rbtree: add random seed
lib/rbtree: split tests
lib/rbtree: enable userland test suite for rbtree related data structure
checkpatch: describe --min-conf-desc-length
scripts/gdb/symbols: determine KASLR offset on s390
...
|
|
Use QEMU's qemu.PhyMemMode [1] functionality to read vmcore from the
physical memory the same way the existing dump tooling does this.
Gracefully handle non-QEMU targets, early boot, and memory corruptions;
print a warning if such situation is detected.
[1] https://qemu-project.gitlab.io/qemu/system/gdb.html#examining-physical-memory
Link: https://lkml.kernel.org/r/20250303110437.79070-1-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andrew Donnellan <ajd@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
When loading symbols from kernel modules we used to iterate
from 0 to module_sect_attrs::nsections, in order to
retrieve their name and address.
However module_sect_attrs::nsections has been removed from
the struct by a previous commit.
Re-arrange the iteration by accessing all items in
module_sect_attrs::grp::bin_attrs[] until NULL is found
(it's a NULL terminated array).
At the same time the symbol address cannot be extracted
from module_sect_attrs::attrs[]::address anymore because
it has also been deleted. Fetch it from
module_sect_attrs::grp::bin_attrs[]::private as described
in 4b2c11e4aaf7.
Link: https://lkml.kernel.org/r/20250221204034.4430-1-antonio@mandelbit.com
Fixes: d8959b947a8d ("module: sysfs: Drop member 'module_sect_attrs::nsections'")
Fixes: 4b2c11e4aaf7 ("module: sysfs: Drop member 'module_sect_attr::address'")
Signed-off-by: Antonio Quartulli <antonio@mandelbit.com>
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
We currently have $lx_per_cpu() which works fine for stuff that kernel
code would access via per_cpu(). But this doesn't work for stuff that
kernel code accesses via per_cpu_ptr():
(gdb) p $lx_per_cpu(node_data[1].node_zones[2]->per_cpu_pageset)
Cannot access memory at address 0xffff11105fbd6c28
This is because we take the address of the pointer and use that as the
offset, instead of using the stored value.
Add a GDB version that mirrors the kernel API, which uses the pointer
value.
To be consistent with per_cpu_ptr(), we need to return the pointer value
instead of dereferencing it for the user. Therefore, move the existing
dereference out of the per_cpu() Python helper and do that only in the
$lx_per_cpu() implementation.
Link: https://lkml.kernel.org/r/20250220-lx-per-cpu-ptr-v2-1-945dee8d8d38@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Florian Rommel <mail@florommel.de>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
No functional change.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250303165246.2175811-10-brgerst@gmail.com
|
|
At least recent gdb releases (seen with 14.2) return SP_EL0 as signed long
which lets the right-shift always return 0.
Link: https://lkml.kernel.org/r/dcd2fabc-9131-4b48-8419-6444e2d67454@siemens.com
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
This avoids spurious message:
(gdb) lx-symbols
loading vmlinux
No source file named kernel/module/main.c.
Link: https://lkml.kernel.org/r/Zy5ALByQtpO-ddh4@Z926fQmE5jqhFMgp6
Signed-off-by: Etienne Buira <etienne.buira@free.fr>
Cc: Andrew Ballance <andrewjballance@gmail.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
This command allows users to quickly translate memory address to the kasan
shadow memory address.
Example output:
(gdb) lx-kasan_mem_to_shadow 0xffff000019acc008
shadow addr: 0xffff600003359801
Link: https://lkml.kernel.org/r/20240723064902.124154-6-kuan-ying.lee@canonical.com
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
This command allows users to quickly retrieve a stacktrace using a handle
obtained from a memory coredump.
Example output:
(gdb) lx-stack_depot_lookup 0x00c80300
0xffff8000807965b4 <kmem_cache_alloc_noprof+660>: mov x20, x0
0xffff800081a077d8 <kmem_cache_oob_alloc+76>: mov x1, x0
0xffff800081a079a0 <test_version_show+100>: cbnz w0, 0xffff800081a07968 <test_version_show+44>
0xffff800082f4a3fc <kobj_attr_show+60>: ldr x19, [sp, #16]
0xffff800080a0fb34 <sysfs_kf_seq_show+460>: ldp x3, x4, [sp, #96]
0xffff800080a0a550 <kernfs_seq_show+296>: ldp x19, x20, [sp, #16]
0xffff8000808e7b40 <seq_read_iter+836>: mov w5, w0
0xffff800080a0b8ac <kernfs_fop_read_iter+804>: mov x23, x0
0xffff800080914a48 <copy_splice_read+972>: mov x6, x0
0xffff8000809151c4 <do_splice_read+348>: ldr x21, [sp, #32]
Link: https://lkml.kernel.org/r/20240723064902.124154-5-kuan-ying.lee@canonical.com
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
(gdb) lx-mounts
mount super_block devname pathname fstype options
Python Exception <class 'gdb.error'>: There is no member named list.
Error occurred in Python: There is no member named list.
We encounter the above issue after commit 2eea9ce4310d ("mounts: keep
list of mounts in an rbtree"). The commit move a mount from list into
rbtree.
So we can instead use rbtree to iterate all mounts information.
Link: https://lkml.kernel.org/r/20240723064902.124154-4-kuan-ying.lee@canonical.com
Fixes: 2eea9ce4310d ("mounts: keep list of mounts in an rbtree")
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
