[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <809e006e-6641-c252-53a1-cc4479d2ca89@de.ibm.com>
Date: Thu, 16 Apr 2020 14:30:36 +0200
From: Christian Borntraeger <borntraeger@...ibm.com>
To: Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org
Cc: linux-arch@...r.kernel.org, kernel-team@...roid.com,
Michael Ellerman <mpe@...erman.id.au>,
Peter Zijlstra <peterz@...radead.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Segher Boessenkool <segher@...nel.crashing.org>,
Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
Arnd Bergmann <arnd@...db.de>,
Peter Oberparleiter <oberpar@...ux.ibm.com>,
Masahiro Yamada <masahiroy@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v3 00/12] Rework READ_ONCE() to improve codegen
On 15.04.20 18:52, Will Deacon wrote:
> Hi everyone,
>
> This is version three of the patches I previously posted for improving
> the code generation of READ_ONCE() and moving the minimum GCC version
> to 4.8:
>
> RFC: https://lore.kernel.org/lkml/20200110165636.28035-1-will@kernel.org
> v2: https://lore.kernel.org/lkml/20200123153341.19947-1-will@kernel.org
>
> Although v2 was queued up by Peter in -tip, it was found to break the
> build for m68k and sparc32. We fixed m68k during the merge window and
> I've since posted patches to fix sparc32 here:
>
> https://lore.kernel.org/lkml/20200414214011.2699-1-will@kernel.org
>
> This series is a refresh on top of 5.7-rc1, the main changes being:
>
> * Fix another issue where 'const' is assigned to non-const via
> WRITE_ONCE(), this time in the tls code
>
> * Fix READ_ONCE_NOCHECK() abuse in arm64 checksum code
>
> * Added Reviewed-bys and Acks from v2
>
> Hopefully this can be considered for 5.8, along with the sparc32 changes.
>
> Cheers,
>
> Will
>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Segher Boessenkool <segher@...nel.crashing.org>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> Cc: Luc Van Oostenryck <luc.vanoostenryck@...il.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Peter Oberparleiter <oberpar@...ux.ibm.com>
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
>
I gave this series a try and s390 seems to compile fine and it also seems to
properly compile the the ipte_unlock_siif function in arch/s390/kvm/gaccess.c
This function was miscompiled with gcc4.6 and the trigger for replacing
ACCESS_ONCE with READ_ONCE
Powered by blists - more mailing lists