linux-toradex.git/arch/alpha/kernel/process.c, branch v6.3

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha

2023-02-25T20:49:29+00:00

Pull alpha updates from Al Viro:
 "Mostly small janitorial fixes but there's also more important ones: a
  patch to fix loading large modules from Edward Humes, and some fixes
  from Al Viro"

[ The fixes from Al mostly came in separately through Al's trees too and
  are now duplicated..   - Linus ]

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha:
  alpha: in_irq() cleanup
  alpha: lazy FPU switching
  alpha/boot/misc: trim unused declarations
  alpha/boot/tools/objstrip: fix the check for ELF header
  alpha/boot: fix the breakage from -isystem series...
  alpha: fix FEN fault handling
  alpha: Avoid comma separated statements
  alpha: fixed a typo in core_cia.c
  alpha: remove unused __SLOW_DOWN_IO and SLOW_DOWN_IO definitions
  alpha: update config files
  alpha: fix R_ALPHA_LITERAL reloc for large modules
  alpha: Add some spaces to ensure format specification
  alpha: replace NR_SYSCALLS by NR_syscalls
  alpha: Remove redundant local asm header redirections
  alpha: Implement "current_stack_pointer"
  alpha: remove redundant err variable
  alpha: osf_sys: reduce kernel log spamming on invalid osf_mount call typenr

alpha: in_irq() cleanup

2023-02-25T04:14:22+00:00

Replace the obsolete and ambiguos macro in_irq() with new
macro in_hardirq().

Signed-off-by: Changbin Du 
Signed-off-by: Matt Turner

alpha: lazy FPU switching

2023-02-25T04:14:22+00:00

	On each context switch we save the FPU registers on stack
of old process and restore FPU registers from the stack of new one.
That allows us to avoid doing that each time we enter/leave the
kernel mode; however, that can get suboptimal in some cases.

	For one thing, we don't need to bother saving anything
for kernel threads.  For another, if between entering and leaving
the kernel a thread gives CPU up more than once, it will do
useless work, saving the same values every time, only to discard
the saved copy as soon as it returns from switch_to().

	Alternative solution:

* move the array we save into from switch_stack to thread_info
* have a (thread-synchronous) flag set when we save them
* have another flag set when they should be restored on return to userland.
* do *NOT* save/restore them in do_switch_stack()/undo_switch_stack().
* restore on the exit to user mode if the restore flag had
been set.  Clear both flags.
* on context switch, entry to fork/clone/vfork, before entry into do_signal()
and on entry into straced syscall save the registers and set the 'saved' flag
unless it had been already set.
* on context switch set the 'restore' flag as well.
* have copy_thread() set both flags for child, so the registers would be
restored once the child returns to userland.
* use the saved data in setup_sigcontext(); have restore_sigcontext() set both flags
and copy from sigframe to save area.
* teach ptrace to look for FPU registers in thread_info instead of
switch_stack.
* teach isolated accesses to FPU registers (rdfpcr, wrfpcr, etc.)
to check the 'saved' flag (under preempt_disable()) and work with the save area
if it's been set; if 'saved' flag is found upon write access, set 'restore' flag
as well.

Signed-off-by: Al Viro 
Signed-off-by: Matt Turner

Merge tag 'mm-nonmm-stable-2023-02-20-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2023-02-24T01:55:40+00:00

Pull non-MM updates from Andrew Morton:
 "There is no particular theme here - mainly quick hits all over the
  tree.

  Most notable is a set of zlib changes from Mikhail Zaslonko which
  enhances and fixes zlib's use of S390 hardware support: 'lib/zlib: Set
  of s390 DFLTCC related patches for kernel zlib'"

* tag 'mm-nonmm-stable-2023-02-20-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (55 commits)
  Update CREDITS file entry for Jesper Juhl
  sparc: allow PM configs for sparc32 COMPILE_TEST
  hung_task: print message when hung_task_warnings gets down to zero.
  arch/Kconfig: fix indentation
  scripts/tags.sh: fix the Kconfig tags generation when using latest ctags
  nilfs2: prevent WARNING in nilfs_dat_commit_end()
  lib/zlib: remove redundation assignement of avail_in dfltcc_gdht()
  lib/Kconfig.debug: do not enable DEBUG_PREEMPT by default
  lib/zlib: DFLTCC always switch to software inflate for Z_PACKET_FLUSH option
  lib/zlib: DFLTCC support inflate with small window
  lib/zlib: Split deflate and inflate states for DFLTCC
  lib/zlib: DFLTCC not writing header bits when avail_out == 0
  lib/zlib: fix DFLTCC ignoring flush modes when avail_in == 0
  lib/zlib: fix DFLTCC not flushing EOBS when creating raw streams
  lib/zlib: implement switching between DFLTCC and software
  lib/zlib: adjust offset calculation for dfltcc_state
  nilfs2: replace WARN_ONs for invalid DAT metadata block requests
  scripts/spelling.txt: add "exsits" pattern and fix typo instances
  fs: gracefully handle ->get_block not mapping bh in __mpage_writepage
  cramfs: Kconfig: fix spelling & punctuation
  ...

arch/alpha/kernel/process.c: remove unnecessary (void*) conversions

2023-02-03T06:50:00+00:00

generic_ptr is a void * type and does not require a cast.

Link: https://lkml.kernel.org/r/20221213073633.3586-1-zeming@nfschina.com
Signed-off-by: Li zeming 
Cc: "Eric W. Biederman" 
Cc: Ivan Kokshaysky 
Cc: Matt Turner 
Cc: Richard Henderson 
Signed-off-by: Andrew Morton

arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled

2023-01-13T10:48:15+00:00

Current arch_cpu_idle() is called with IRQs disabled, but will return
with IRQs enabled.

However, the very first thing the generic code does after calling
arch_cpu_idle() is raw_local_irq_disable(). This means that
architectures that can idle with IRQs disabled end up doing a
pointless 'enable-disable' dance.

Therefore, push this IRQ disabling into the idle function, meaning
that those architectures can avoid the pointless IRQ state flipping.

Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Ingo Molnar 
Tested-by: Tony Lindgren 
Tested-by: Ulf Hansson 
Reviewed-by: Gautham R. Shenoy 
Acked-by: Mark Rutland  [arm64]
Acked-by: Rafael J. Wysocki 
Acked-by: Guo Ren 
Acked-by: Frederic Weisbecker 
Link: https://lore.kernel.org/r/20230112195540.618076436@infradead.org

[elf][non-regset] uninline elf_core_copy_task_fpregs() (and lose pt_regs argument)

2022-11-25T04:24:23+00:00

Don't bother with pointless macros - we are not sharing it with aout coredumps
anymore.  Just convert the underlying functions to the same arguments (nobody
uses regs, actually) and call them elf_core_copy_task_fpregs().  And unexport
the entire bunch, while we are at it.

[added missing includes in arch/{csky,m68k,um}/kernel/process.c to avoid extra
warnings about the lack of externs getting added to huge piles for those
files.  Pointless, but...]

Signed-off-by: Al Viro

kernel: exit: cleanup release_thread()

2022-09-12T04:55:07+00:00

Only x86 has own release_thread(), introduce a new weak release_thread()
function to clean empty definitions in other ARCHs.

Link: https://lkml.kernel.org/r/20220819014406.32266-1-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang 
Acked-by: Guo Ren 				[csky]
Acked-by: Russell King (Oracle) 
Acked-by: Geert Uytterhoeven 
Acked-by: Brian Cain 
Acked-by: Michael Ellerman 			[powerpc]
Acked-by: Stafford Horne 			[openrisc]
Acked-by: Catalin Marinas 		[arm64]
Acked-by: Huacai Chen 			[LoongArch]
Cc: Alexander Gordeev 
Cc: Anton Ivanov 
Cc: Borislav Petkov 
Cc: Christian Borntraeger 
Cc: Christophe Leroy 
Cc: Chris Zankel 
Cc: Dave Hansen 
Cc: "David S. Miller" 
Cc: Dinh Nguyen 
Cc: Guo Ren  [csky]
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: Ingo Molnar 
Cc: Ivan Kokshaysky 
Cc: James Bottomley 
Cc: Johannes Berg 
Cc: Jonas Bonn 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michal Simek 
Cc: Nicholas Piggin 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Richard Henderson 
Cc: Richard Weinberger 
Cc: Rich Felker 
Cc: Stefan Kristiansson 
Cc: Sven Schnelle 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Vasily Gorbik 
Cc: Vineet Gupta 
Cc: Will Deacon 
Cc: Xuerui Wang 
Cc: Yoshinori Sato 
Signed-off-by: Andrew Morton

Merge tag 'bitmap-for-5.19-rc1' of https://github.com/norov/linux

2022-06-04T21:04:27+00:00

Pull bitmap updates from Yury Norov:

 - bitmap: optimize bitmap_weight() usage, from me

 - lib/bitmap.c make bitmap_print_bitmask_to_buf parseable, from Mauro
   Carvalho Chehab

 - include/linux/find: Fix documentation, from Anna-Maria Behnsen

 - bitmap: fix conversion from/to fix-sized arrays, from me

 - bitmap: Fix return values to be unsigned, from Kees Cook

It has been in linux-next for at least a week with no problems.

* tag 'bitmap-for-5.19-rc1' of https://github.com/norov/linux: (31 commits)
  nodemask: Fix return values to be unsigned
  bitmap: Fix return values to be unsigned
  KVM: x86: hyper-v: replace bitmap_weight() with hweight64()
  KVM: x86: hyper-v: fix type of valid_bank_mask
  ia64: cleanup remove_siblinginfo()
  drm/amd/pm: use bitmap_{from,to}_arr32 where appropriate
  KVM: s390: replace bitmap_copy with bitmap_{from,to}_arr64 where appropriate
  lib/bitmap: add test for bitmap_{from,to}_arr64
  lib: add bitmap_{from,to}_arr64
  lib/bitmap: extend comment for bitmap_(from,to)_arr32()
  include/linux/find: Fix documentation
  lib/bitmap.c make bitmap_print_bitmask_to_buf parseable
  MAINTAINERS: add cpumask and nodemask files to BITMAP_API
  arch/x86: replace nodes_weight with nodes_empty where appropriate
  mm/vmstat: replace cpumask_weight with cpumask_empty where appropriate
  clocksource: replace cpumask_weight with cpumask_empty in clocksource.c
  genirq/affinity: replace cpumask_weight with cpumask_empty where appropriate
  irq: mips: replace cpumask_weight with cpumask_empty where appropriate
  drm/i915/pmu: replace cpumask_weight with cpumask_empty where appropriate
  arch/x86: replace cpumask_weight with cpumask_empty where appropriate
  ...

arch/alpha: replace cpumask_weight with cpumask_empty where appropriate

2022-06-03T13:52:57+00:00

common_shutdown_1() calls cpumask_weight() to check if any bit of a
given cpumask is set. We can do it more efficiently with cpumask_empty()
because cpumask_empty() stops traversing the cpumask as soon as it finds
first set bit, while cpumask_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov