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

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Date:   Tue, 23 Jun 2020 06:43:09 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Marco Elver <elver@...gle.com>
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, Jun 23, 2020 at 08:31:15AM +0200, Marco Elver wrote:
> 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 && (....)).

Very good, I will rebase the following into the KCSAN branch for v5.9:

	3e490e3 kcsan: Re-add GCC as a supported compiler
	03296de kcsan: Simplify compiler flags
	d831090 kcsan: Disable branch tracing in core runtime

Please let me know if any other adjustments are needed.

							Thanx, Paul