linux-kernel - Re: [PATCH v2 17/19] kasan: remove atomic accesses to stack ring entries

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Message-ID: <CAG_fn=VJtzkvrMu84BuNtbjkmRuQx7aLLSsew-Hns5bAdSnm2Q@mail.gmail.com>
Date:   Mon, 9 Oct 2023 14:05:16 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        Evgenii Stepanov <eugenis@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v2 17/19] kasan: remove atomic accesses to stack ring entries

On Wed, Sep 13, 2023 at 7:17 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Remove the atomic accesses to entry fields in save_stack_info and
> kasan_complete_mode_report_info for tag-based KASAN modes.
>
> These atomics are not required, as the read/write lock prevents the
> entries from being read (in kasan_complete_mode_report_info) while being
> written (in save_stack_info) and the try_cmpxchg prevents the same entry
> from being rewritten (in save_stack_info) in the unlikely case of wrapping
> during writing.

Given that you removed all atomic accesses, it should be fine to
remove the inclusion of atomic.h as well.

> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>