Re: [PATCH v6 5/7] riscv: stacktrace: switch to frame-pointer based unwinder

[sashiko-bot@kernel.org]

> From: Wang Han <wanghan@linux.alibaba.com>
> 
> Replace the open-coded frame-pointer walker in arch_stack_walk() with a
> robust kunwind state machine, modelled on arch/arm64/kernel/stacktrace.c
> and retargeted to the RISC-V {fp, ra} frame record convention. The new
> walker tracks stack bounds, consumes frame records monotonically,
> understands the metadata pt_regs records added in the previous frame
> record metadata patch, and recovers return addresses replaced by
> function graph tracing and kretprobes.
> 
> This commit introduces arch_stack_walk_reliable() but does not yet
> select HAVE_RELIABLE_STACKTRACE; that is done in a follow-up Kconfig
> patch so this commit can be reviewed and bisected as a pure unwinder
> replacement. Until that Kconfig change lands, livepatch is not yet
> enabled and arch_stack_walk_reliable() has no in-tree caller.
> [ ... ]
> !CONFIG_FRAME_POINTER builds.
> 
> Assisted-by: Qoder:Qwen-3.8-MAX-Preview
> Signed-off-by: Wang Han <wanghan@linux.alibaba.com>
> Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260914092648.51254-1-xueshuai@linux.alibaba.com?part=5