linux-kernel - Re: [PATCH 20/32] s390: Turn off KMSAN for boot, vdso and purgatory

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Date:   Thu, 16 Nov 2023 10:20:31 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Ilya Leoshkevich <iii@...ux.ibm.com>
Cc:     Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Marco Elver <elver@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Pekka Enberg <penberg@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-s390@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Sven Schnelle <svens@...ux.ibm.com>
Subject: Re: [PATCH 20/32] s390: Turn off KMSAN for boot, vdso and purgatory

On Wed, Nov 15, 2023 at 9:34 PM Ilya Leoshkevich <iii@...ux.ibm.com> wrote:
>
> All other sanitizers are disabled for these components as well.
>
> Reviewed-by: Alexander Gordeev <agordeev@...ux.ibm.com>
> Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>
(see a nit below)

> ---
>  arch/s390/boot/Makefile          | 1 +
>  arch/s390/kernel/vdso32/Makefile | 1 +
>  arch/s390/kernel/vdso64/Makefile | 1 +
>  arch/s390/purgatory/Makefile     | 1 +
>  4 files changed, 4 insertions(+)
>
> diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
> index c7c81e5f9218..5a05c927f703 100644
> --- a/arch/s390/boot/Makefile
> +++ b/arch/s390/boot/Makefile
> @@ -8,6 +8,7 @@ GCOV_PROFILE := n
>  UBSAN_SANITIZE := n
>  KASAN_SANITIZE := n
>  KCSAN_SANITIZE := n
> +KMSAN_SANITIZE := n

Nit: I think having even a one-line comment before this block
(something similar to
https://elixir.bootlin.com/linux/latest/source/arch/x86/boot/Makefile#L12)
will make it more clear.

But given that the comment wasn't there before, leaving this up to you.