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

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Message-ID: <20200624200810.GA20999@paulmck-ThinkPad-P72>
Date:   Wed, 24 Jun 2020 13:08:10 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        kernel-team@...com, mingo@...nel.org
Cc:     elver@...gle.com, andreyknvl@...gle.com, glider@...gle.com,
        dvyukov@...gle.com, cai@....pw, boqun.feng@...il.com
Subject: Re: [PATCH kcsan 0/10] KCSAN updates for v5.9

On Wed, Jun 24, 2020 at 12:02:36PM -0700, Paul E. McKenney wrote:
> On Mon, Jun 22, 2020 at 05:43:10PM -0700, Paul E. McKenney wrote:
> > Hello!
> > 
> > This series provides KCSAN updates:
> 
> And three more, so that GCC can join Clang in the KCSAN fun.
> 
> > 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.
> 
> 11.	Re-add GCC as a supported compiler.
> 
> 12.	Simplify compiler flags.
> 
> 13.	Disable branch tracing in core runtime.

All three of which, I should hasten to add, are courtesy of Marco Elver.

> Please note that using GCC for KCSAN requires building your own compiler
> from recent mainline.

							Thanx, Paul

> ------------------------------------------------------------------------
> The added three (#11-#13) only:
> ------------------------------------------------------------------------
> 
>  Documentation/dev-tools/kcsan.rst |    3 ++-
>  kernel/kcsan/Makefile             |    6 +++---
>  lib/Kconfig.kcsan                 |    3 ++-
>  scripts/Makefile.kcsan            |    2 +-
>  4 files changed, 8 insertions(+), 6 deletions(-)