linux-kernel - Re: [PATCHv4 02/12] atomics/x86: reduce arch

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Date:   Mon, 16 Jul 2018 21:23:57 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Mark Rutland <mark.rutland@....com>
cc:     mingo@...nel.org, mingo@...hat.com, andy.shevchenko@...il.com,
        arnd@...db.de, aryabinin@...tuozzo.com, boqun.feng@...il.com,
        catalin.marinas@....com, dvyukov@...gle.com, glider@...gle.com,
        hpa@...or.com, linux-kernel@...r.kernel.org,
        parri.andrea@...il.com, peter@...leysoftware.com,
        peterz@...radead.org, will.deacon@....com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv4 02/12] atomics/x86: reduce arch_cmpxchg64*()
 instrumentation

On Mon, 16 Jul 2018, Mark Rutland wrote:
> Currently x86's arch_cmpxchg64() and arch_cmpxchg64_local() are
> instrumented twice, as they call into instrumented atomics rather than
> their arch_ equivalents.
> 
> A call to cmpxchg64() results in:
> 
>   cmpxchg64()
>     kasan_check_write()
>     arch_cmpxchg64()
>       cmpxchg()
>         kasan_check_write()
>         arch_cmpxchg()
> 
> Let's fix this up and call the arch_ equivalents, resulting in:
> 
>   cmpxchg64()
>     kasan_check_write()
>     arch_cmpxchg64()
>       arch_cmpxchg()
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Acked-by: Will Deacon <will.deacon@....com>

Acked-by: Thomas Gleixner <tglx@...utronix.de>