linux-kernel - Re: [PATCH 2/3] asm-generic, x86: wrap atomic operations

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Message-ID: <CACT4Y+bJOw_iMMkMw89oMqNsBCbqapXrS1Sk1uigjgB_7mnAgg@mail.gmail.com>
Date:   Wed, 22 Mar 2017 13:14:41 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mark Rutland <mark.rutland@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "x86@...nel.org" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] asm-generic, x86: wrap atomic operations

On Wed, Mar 22, 2017 at 12:30 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wed, Mar 22, 2017 at 11:42 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
>> On Tue, Mar 21, 2017 at 10:20 PM, Arnd Bergmann <arnd@...db.de> wrote:
>>> On Tue, Mar 21, 2017 at 7:06 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
>>
>> Initially I've tested with my stock gcc 4.8.4 (Ubuntu
>> 4.8.4-2ubuntu1~14.04.3) and amusingly it works. But I can reproduce
>> the bug with 7.0.1.
>
> It's probably because gcc-4.8 didn't support KASAN yet, so the added
> check had no effect.

I've tested without KASAN with both compilers.