linux-kernel - Re: [PATCH 3/7] ARM: implement ARCH

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Date:   Fri, 22 Oct 2021 09:18:46 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, akpm@...ux-foundation.org,
        mark.rutland@....com, zhengqi.arch@...edance.com,
        linux@...linux.org.uk, catalin.marinas@....com, will@...nel.org,
        mpe@...erman.id.au, paul.walmsley@...ive.com, palmer@...belt.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com, borntraeger@...ibm.com,
        linux-arch@...r.kernel.org, ardb@...nel.org
Subject: Re: [PATCH 3/7] ARM: implement ARCH_STACKWALK

On Fri, Oct 22, 2021 at 05:09:36PM +0200, Peter Zijlstra wrote:
> From: Ard Biesheuvel <ardb@...nel.org>
> 
> Implement the flavor of CONFIG_STACKTRACE that relies mostly on generic
> code, and only need a small arch_stack_walk() helper that performs the
> actual frame unwinding.
> 
> Note that this removes the SMP check that used to live in
> __save_stack_trace(), but this is no longer needed now that the generic
> version of save_stack_trace_tsk() takes care not to walk the call stack
> of tasks that are live on other CPUs.
> 
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook