linux-kernel - Re: [PATCH v2 1/2] arm64: kasan: do not instrument stacktrace.c

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Date:   Tue, 28 Jun 2022 15:14:24 +0200
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Will Deacon <will@...nel.org>
Cc:     andrey.konovalov@...ux.dev,
        Catalin Marinas <catalin.marinas@....com>,
        kernel-team@...roid.com, Alexander Potapenko <glider@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] arm64: kasan: do not instrument stacktrace.c

On Thu, Jun 23, 2022 at 9:31 PM Will Deacon <will@...nel.org> wrote:
>
> On Mon, 23 May 2022 16:51:51 +0200, andrey.konovalov@...ux.dev wrote:
> > From: Andrey Konovalov <andreyknvl@...gle.com>
> >
> > Disable KASAN instrumentation of arch/arm64/kernel/stacktrace.c.
> >
> > This speeds up Generic KASAN by 5-20%.
> >
> > As a side-effect, KASAN is now unable to detect bugs in the stack trace
> > collection code. This is taken as an acceptable downside.
> >
> > [...]
>
> Applied to arm64 (for-next/stacktrace), thanks! I had to fix conflicts
> in both of the patches, so please can you take a quick look at the result?
>
> [1/2] arm64: kasan: do not instrument stacktrace.c
>       https://git.kernel.org/arm64/c/802b91118d11
> [2/2] arm64: stacktrace: use non-atomic __set_bit
>       https://git.kernel.org/arm64/c/446297b28a21

Hi Will,

The updated patches look good.

Thanks!