linux-kernel - [PATCH 0/7] arch: More wchan fixes

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Message-ID: <20211022150933.883959987@infradead.org>
Date:   Fri, 22 Oct 2021 17:09:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     keescook@...omium.org, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.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: [PATCH 0/7] arch: More wchan fixes

Hi,

Respin of the rest of the get_wchan() rework [1]. Given the many problems with
STACKTRACE this series focuses on the newer ARCH_STACKWALK since that's a
smaller set of architectures to review with a better specified interface.

The idea is to piece-wise convert the rest of the architectures to
ARCH_STACKWALK, but that can be done at leasure.

PowerPC and ARM64 are a bit funny in that their __switch_to() is in C and ends
up on the stack. For now simply mark it __sched to make it work. Mark wanted to
maybe do something different, but I think this ought to get us started.