From: Arnd Bergmann <arnd@arndb.de>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mark Rutland <mark.rutland@arm.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Peter Zijlstra <peterz@infradead.org>,
Will Deacon <will.deacon@arm.com>, Linux-MM <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] asm-generic: fix compilation failure in cmpxchg_double()
Date: Wed, 22 Mar 2017 22:27:12 +0100 [thread overview]
Message-ID: <CAK8P3a2DskgumXx5XuzN8J-T0jmhXgD5dPZ4QWBtDA3WvMCyoQ@mail.gmail.com> (raw)
In-Reply-To: <CAK8P3a2pm2EsxOxxf7SsEObxcNFJP60JOY_78a19g2kD4pL6Rw@mail.gmail.com>
On Wed, Mar 22, 2017 at 12:27 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Wed, Mar 22, 2017 at 12:10 PM, Dmitry Vyukov <dvyukov@google.com> wrote:
>> Arnd reported that the new code leads to compilation failures
>> with some versions of gcc. I've filed gcc issue 72873,
>> but we need a kernel fix as well.
>>
>> Remove instrumentation from cmpxchg_double() for now.
>
> Thanks, I also checked that fixes the build error for me.
I got a new variant of the bug in
arch/x86/include/asm/cmpxchg_32.h:set_64bit() now.
In file included from /git/arm-soc/arch/x86/include/asm/cmpxchg.h:142:0,
from /git/arm-soc/arch/x86/include/asm/atomic.h:7,
from /git/arm-soc/arch/x86/include/asm/msr.h:66,
from /git/arm-soc/arch/x86/include/asm/processor.h:20,
from /git/arm-soc/arch/x86/include/asm/cpufeature.h:4,
from /git/arm-soc/arch/x86/include/asm/thread_info.h:52,
from /git/arm-soc/include/linux/thread_info.h:25,
from /git/arm-soc/arch/x86/include/asm/preempt.h:6,
from /git/arm-soc/include/linux/preempt.h:80,
from /git/arm-soc/include/linux/spinlock.h:50,
from /git/arm-soc/include/linux/mmzone.h:7,
from /git/arm-soc/include/linux/gfp.h:5,
from /git/arm-soc/include/linux/mm.h:9,
from /git/arm-soc/mm/khugepaged.c:3:
/git/arm-soc/mm/khugepaged.c: In function 'khugepaged':
/git/arm-soc/arch/x86/include/asm/cmpxchg_32.h:29:2: error: 'asm'
operand has impossible constraints
asm volatile("\n1:\t"
Defconfig is at http://pastebin.com/raw/Pthhv5iU
Arnd
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next prev parent reply other threads:[~2017-03-22 21:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-22 11:10 Dmitry Vyukov
2017-03-22 11:27 ` Arnd Bergmann
2017-03-22 21:27 ` Arnd Bergmann [this message]
2017-03-23 8:49 ` Dmitry Vyukov
2017-03-23 13:31 ` Arnd Bergmann
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