linux-kernel - Re: [PATCH kcsan 0/10] KCSAN updates for v5.9

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Message-ID: <CANpmjNOV=rGaDmvU+neSe8Pyz-Jezm6c45LS0-DJHADNU9H_QA@mail.gmail.com>
Date:   Tue, 23 Jun 2020 08:31:15 +0200
From:   Marco Elver <elver@...gle.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>, kernel-team@...com,
        Ingo Molnar <mingo@...nel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, Qian Cai <cai@....pw>,
        Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH kcsan 0/10] KCSAN updates for v5.9

On Tue, 23 Jun 2020 at 02:43, Paul E. McKenney <paulmck@...nel.org> wrote:
>
> Hello!
>
> This series provides KCSAN updates:
>
> 1.      Annotate a data race in vm_area_dup(), courtesy of Qian Cai.
>
> 2.      x86/mm/pat: Mark an intentional data race, courtesy of Qian Cai.
>
> 3.      Add ASSERT_EXCLUSIVE_ACCESS() to __list_splice_init_rcu().
>
> 4.      Add test suite, courtesy of Marco Elver.
>
> 5.      locking/osq_lock: Annotate a data race in osq_lock.
>
> 6.      Prefer '__no_kcsan inline' in test, courtesy of Marco Elver.
>
> 7.      Silence -Wmissing-prototypes warning with W=1, courtesy of Qian Cai.
>
> 8.      Rename test.c to selftest.c, courtesy of Marco Elver.
>
> 9.      Remove existing special atomic rules, courtesy of Marco Elver.
>
> 10.     Add jiffies test to test suite, courtesy of Marco Elver.

Do we want GCC support back for 5.9?

   https://lkml.kernel.org/r/20200618093118.247375-1-elver@google.com

I was hoping it could go into 5.9, because it makes a big difference
in terms of usability as it provides more compiler choice. The only
significant change for GCC support is the addition of the checking of
(CC_IS_GCC && (....)).

Thanks,
-- Marco