linux-kernel - Re: READ_ONCE() + STACKPROTECTOR_STRONG == :/ (was Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.5-2 tag (topic/kasan-bitops))

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Message-ID: <CAHk-=wgsbrq6sFOSd9QrjR-fCamgzqCtFuO2_8qvJANA1+Jm6g@mail.gmail.com>
Date:   Tue, 17 Dec 2019 10:05:53 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Will Deacon <will@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Daniel Axtens <dja@...ens.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        linux-arch <linux-arch@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Segher Boessenkool <segher@...nel.crashing.org>,
        Arnd Bergmann <arnd@...db.de>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: READ_ONCE() + STACKPROTECTOR_STRONG == :/ (was Re: [GIT PULL]
 Please pull powerpc/linux.git powerpc-5.5-2 tag (topic/kasan-bitops))

On Tue, Dec 17, 2019 at 10:04 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Let me think about it.

.. and in the short term, maybe for code generation, the right thing
is to just do the cast in the bitops, where we can just cast to
"unsigned long *" and remove the volatile that way.

I'm still hoping there's a trick, but..

           Linus