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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri, 13 Dec 2019 14:01:10 -0800
Message-ID: <CAHk-=wgsN+0i8mF_1L8zDvY0XJEkZNumT1dH0NBiSbecZZ3+HA@mail.gmail.com>
Subject: Re: READ_ONCE() + STACKPROTECTOR_STRONG == :/ (was Re: [GIT PULL]
 Please pull powerpc/linux.git powerpc-5.5-2 tag (topic/kasan-bitops))
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Will Deacon <will@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Daniel Axtens <dja@axtens.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        linux-arch <linux-arch@vger.kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Segher Boessenkool <segher@kernel.crashing.org>,
        Christian Borntraeger <borntraeger@de.ibm.com>
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On Fri, Dec 13, 2019 at 1:33 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> A few hundred randconfig (x86, arm32 and arm64) builds later I
> still only found one other instance:

Just send me the pull request to READ_ONCE() and WRITE_ONCE() be
arithmetic types, and your two trivial fixes, and let's get this over
with.

With that, you can remove the 'volatile' with my simple
'typeof(0+*(p))' trick, and we're all good, and we don't need to worry
about compiler versions either.

I'm willing to take that after the merge window as a "sanity fix".

             Linus