[PATCH v2 0/8] arm64: stacktrace: cleanups and improvements

[Madhavan T. Venkataraman]

Thanks for the improvements.

For the whole series:

Reviewed-by: Madhavan T. Venkataraman <madvenka at linux.microsoft.com>

On 8/5/22 07:45, Mark Rutland wrote:
> Hi Marc,
> 
> This series is a set of improvements for the recently merged stacktrace
> rework queued in the kvmarm next branch, along the lines of my prior
> suggestions. I'm hoping that it would be possible to queue this for
> -rc1.
> 
> Largely, the series decouples portions of the unwind code, making some
> structural changes that remove the need for coupling (e.g. removing the
> need for the stack type enumeration, and factoring out callbacks). This
> should make it easier to make some further changes I have spoken about
> previously (e.g. adding some metadata to the stack dump output), and I
> have some patches building atop this which I intend to send out once
> this is merged.
> 
> The only (intended) functional change from this series is improved
> boundary detection, where overlapping frame records will now be caught
> and rejected.
> 
> I've tested this natively (with the ftrace tests, LKDTM, and
> /proc/self/stack), which seems happy.
> 
> I've also tested the NVHE and PKVM unwinders by hacking a BUG() into the
> hyp code shortly after the KVM hyp code is initialized, and in both
> cases the output is unchanged.
> 
> Since v1 [1]:
> * Fix build warning with CONFIG_SDEI_INTERFACE=y && W=1
> * Fix typos
> * Fix whitespace errors
> * Apply tags from Kalesh Singh and Mark Brown
> 
> [1] https://lore.kernel.org/r/20220801121209.2479449-1-mark.rutland@arm.com
> 
> Thanks,
> Mark.
> 
> Mark Rutland (8):
>   arm64: stacktrace: simplify unwind_next_common()
>   arm64: stacktrace: rename unwind_next_common() ->
>     unwind_next_frame_record()
>   arm64: stacktrace: move SDEI stack helpers to stacktrace code
>   arm64: stacktrace: add stackinfo_on_stack() helper
>   arm64: stacktrace: rework stack boundary discovery
>   arm64: stacktrace: remove stack type from fp translator
>   arm64: stacktrace: track all stack boundaries explicitly
>   arm64: stacktrace: track hyp stacks in unwinder's address space
> 
>  arch/arm64/include/asm/processor.h         |   2 +-
>  arch/arm64/include/asm/sdei.h              |  17 --
>  arch/arm64/include/asm/stacktrace.h        |  71 +++++--
>  arch/arm64/include/asm/stacktrace/common.h | 211 +++++++++------------
>  arch/arm64/kernel/ptrace.c                 |   2 +-
>  arch/arm64/kernel/sdei.c                   |  32 ----
>  arch/arm64/kernel/stacktrace.c             |  66 ++++---
>  arch/arm64/kvm/hyp/nvhe/stacktrace.c       |  40 ++--
>  arch/arm64/kvm/stacktrace.c                | 135 +++++++------
>  9 files changed, 288 insertions(+), 288 deletions(-)
>