[PATCH v4 0/2] ARM: Convert to ARCH_STACKWALK

[Li Huafei]

This series mainly updates the ARM stack trace code to use the newer and
simpler arch_stack_walk() interface.

When Russell applied patch 1, the patch tracker complained of a minor
conflict with Lei Zhen's patch (see [1]). Lei Zhen's patch has been
merged into v6.1-rc1. Now rebase to v6.1-rc1 and resend this patch set.

Thanks!

[1] https://www.armlinux.org.uk/developer/patches/viewpatch.php?id=9235/1

v4:
 - Rebase to v6.1-rc1.
 - Fix commit log for patch 2: 'arch _stack_walk()' -> 'arch_stack_walk()'.
 - Remove the two bugfix patches that have been merged in:
    ARM: stacktrace: Skip frame pointer boundary check for call_with_stack()
    ARM: stacktrace: Avoid duplicate saving of exception PC value

v3 resend: https://lore.kernel.org/lkml/20220826074047.107357-1-lihuafei1@huawei.com/
 It's been a month since I sent the v3. Linus told me I needed to add the
 patch to Russell's patch tracker myself, rebase to v6.0-rc1 before that.
 Thanks Linus for the tip!

 Since commit af6f23b88e95 ("ARM/dma-mapping: use the generic versions of
 dma_to_phys/phys_to_dma by default") and commit ae626eb97376
 ("ARM/dma-mapping: use dma-direct unconditionally") modified
 arch/arm/Kconfig, there is a minor conflict with patch 4 when rebase.

v3: https://lore.kernel.org/lkml/20220727040022.139387-1-lihuafei1@huawei.com/
 - According to the discussion with Linus and Russell in v1:
   - Add a comment about "regs[1]" in patch 2, and remove the
     unnecessary ternary operator in the initialization of
     "frame->ex_frame".
   - Remove the patch "ARM: stacktrace: Allow stack trace saving for
     non-current tasks", and keep the check for not being able to
     unwind non-current tasks (including tasks running on other CPUs)
     when CONFIG_SMP=y in patch 4.
 - Rebase to linux-5.19-rc8.

v2: https://lore.kernel.org/lkml/20220713110020.85511-1-lihuafei1@huawei.com/
 - As suggested by Mark, the commit logs for patch 4 and 5 were
   refined for easy review.

v1: https://lore.kernel.org/lkml/20220712021527.109921-1-lihuafei1@huawei.com/

Li Huafei (2):
  ARM: stacktrace: Make stack walk callback consistent with generic code
  ARM: stacktrace: Convert stacktrace to generic ARCH_STACKWALK

 arch/arm/Kconfig                  |   1 +
 arch/arm/include/asm/stacktrace.h |   2 +-
 arch/arm/kernel/perf_callchain.c  |   9 +--
 arch/arm/kernel/return_address.c  |   8 +-
 arch/arm/kernel/stacktrace.c      | 119 +++++++++---------------------
 5 files changed, 44 insertions(+), 95 deletions(-)

-- 
2.17.1