linux-toradex.git/arch/arm64/include/asm, branch v3.15.2

arm64: mm: fix pmd_write CoW brokenness

2014-05-29T10:31:14+00:00

Commit 9c7e535fcc17 ("arm64: mm: Route pmd thp functions through pte
equivalents") changed the pmd manipulator and accessor functions to
convert the target pmd to a pte, process it with the pte functions, then
convert it back. Along the way, we gained support for PTE_WRITE, however
this is completely ignored by set_pmd_at, and so we fail to set the
PMD_SECT_RDONLY for PMDs, resulting in all sorts of lovely failures (like
CoW not working).

Partially reverting the offending commit (by making use of
PMD_SECT_RDONLY explicitly for pmd_{write,wrprotect,mkwrite} functions)
leads to further issues because pmd_write can then return potentially
incorrect values for page table entries marked as RDONLY, leading to
BUG_ON(pmd_write(entry)) tripping under some THP workloads.

This patch fixes the issue by routing set_pmd_at through set_pte_at,
which correctly takes the PTE_WRITE flag into account. Given that
THP mappings are always anonymous, the additional cache-flushing code
in __sync_icache_dcache won't impose any significant overhead as the
flush will be skipped.

Cc: Catalin Marinas 
Acked-by: Steve Capper 
Tested-by: Marc Zyngier 
Signed-off-by: Will Deacon

Merge tag 'stable/for-linus-3.15-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2014-05-13T02:21:01+00:00

Pull xen bug fixes from David Vrabel:
 - Fix arm64 crash on boot.
 - Quiet a noisy arm build warning (virt_to_pfn() redefined).

* tag 'stable/for-linus-3.15-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  arm64: introduce virt_to_pfn
  xen/events/fifo: correctly align bitops
  arm/xen: Remove definiition of virt_to_pfn in asm/xen/page.h

arm64: introduce virt_to_pfn

2014-05-12T10:51:28+00:00

virt_to_pfn has been defined in arch/arm/include/asm/memory.h by commit
e26a9e0 "ARM: Better virt_to_page() handling" and Xen has come to rely
on it.  Introduce virt_to_pfn on arm64 too.

Signed-off-by: Stefano Stabellini 
Acked-by: Catalin Marinas

arm64: initialize spinlock for init_mm's context

2014-04-25T15:46:51+00:00

ARM64 has defined the spinlock for init_mm's context, so need initialize
the spinlock structure; otherwise during the suspend flow it will dump
the info for spinlock's bad magic warning as below:

[   39.084394] Disabling non-boot CPUs ...
[   39.092871] BUG: spinlock bad magic on CPU#1, swapper/1/0
[   39.092896]  lock: init_mm+0x338/0x3e0, .magic: 00000000, .owner: /-1, .owner_cpu: 0
[   39.092907] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G           O 3.10.33 #125
[   39.092912] Call trace:
[   39.092927] [] dump_backtrace+0x0/0x16c
[   39.092934] [] show_stack+0x10/0x1c
[   39.092947] [] dump_stack+0x1c/0x28
[   39.092953] [] spin_dump+0x78/0x88
[   39.092960] [] spin_bug+0x24/0x34
[   39.092971] [] do_raw_spin_lock+0x98/0x17c
[   39.092979] [] _raw_spin_lock_irqsave+0x4c/0x60
[   39.092990] [] set_mm_context+0x1c/0x6c
[   39.092996] [] __new_context+0x94/0x10c
[   39.093007] [] idle_task_exit+0x104/0x1b0
[   39.093014] [] cpu_die+0x14/0x74
[   39.093021] [] arch_cpu_idle_dead+0x8/0x14
[   39.093030] [] cpu_startup_entry+0x1ec/0x258
[   39.093036] [] secondary_start_kernel+0x114/0x124

Signed-off-by: Leo Yan 
Acked-by: Will Deacon 
Signed-off-by: Catalin Marinas

arm64: mm: Add THP TLB entries to general mmu_gather

2014-04-25T15:46:49+00:00

When arm64 moved over to the core mmu_gather, it lost the logic to
flush THP TLB entries (tlb_remove_pmd_tlb_entry was removed and the
core implementation only signals that the mmu_gather needs a flush).

This patch ensures that tlb_add_flush is called for THP TLB entries.

Signed-off-by: Steve Capper 
Acked-by: Will Deacon 
Signed-off-by: Catalin Marinas

arm64: add renameat2 compat syscall

2014-04-23T09:22:33+00:00

Wire up the renameat2 syscall for compat (AArch32) applications.

Signed-off-by: Miklos Szeredi 
Signed-off-by: Catalin Marinas

arm64: __NR_compat_syscalls fix

2014-04-22T16:42:04+00:00

This fixes commit 6290b53de025 (arm64: compat: Wire up new AArch32 syscalls)
which did not update __NR_compat_syscalls accordingly.

Signed-off-by: Miklos Szeredi 
Cc:  # 3.14+
Signed-off-by: Catalin Marinas

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2014-04-08T19:06:03+00:00

Pull second set of arm64 updates from Catalin Marinas:
 "A second pull request for this merging window, mainly with fixes and
  docs clarification:

   - Documentation clarification on CPU topology and booting
     requirements
   - Additional cache flushing during boot (needed in the presence of
     external caches or under virtualisation)
   - DMA range invalidation fix for non cache line aligned buffers
   - Build failure fix with !COMPAT
   - Kconfig update for STRICT_DEVMEM"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Fix DMA range invalidation for cache line unaligned buffers
  arm64: Add missing Kconfig for CONFIG_STRICT_DEVMEM
  arm64: fix !CONFIG_COMPAT build failures
  Revert "arm64: virt: ensure visibility of __boot_cpu_mode"
  arm64: Relax the kernel cache requirements for boot
  arm64: Update the TCR_EL1 translation granule definitions for 16K pages
  ARM: topology: Make it clear that all CPUs need to be described

arm64: add early_ioremap support

2014-04-07T23:36:15+00:00

Add support for early IO or memory mappings which are needed before the
normal ioremap() is usable.  This also adds fixmap support for permanent
fixed mappings such as that used by the earlyprintk device register
region.

Signed-off-by: Mark Salter 
Acked-by: Catalin Marinas 
Cc: Borislav Petkov 
Cc: Dave Young 
Cc: H. Peter Anvin 
Cc: Will Deacon 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

arm64: initialize pgprot info earlier in boot

2014-04-07T23:36:15+00:00

Presently, paging_init() calls init_mem_pgprot() to initialize pgprot
values used by macros such as PAGE_KERNEL, PAGE_KERNEL_EXEC, etc.

The new fixmap and early_ioremap support also needs to use these macros
before paging_init() is called.  This patch moves the init_mem_pgprot()
call out of paging_init() and into setup_arch() so that pgprot_default
gets initialized in time for fixmap and early_ioremap.

Signed-off-by: Mark Salter 
Acked-by: Catalin Marinas 
Cc: Will Deacon 
Cc: Borislav Petkov 
Cc: Dave Young 
Cc: H. Peter Anvin 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds