linux-kernel - Re: [PATCH 6/6] Documentation/memory-barriers.txt: Clarify cmpxchg()

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Message-ID: <20191015012604.eonteqarhvgmrzuc@linux-p48b>
Date:   Mon, 14 Oct 2019 18:26:04 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Manfred Spraul <manfred@...orfullife.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Waiman Long <longman@...hat.com>, 1vier1@....de,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 6/6] Documentation/memory-barriers.txt: Clarify cmpxchg()

On Sat, 12 Oct 2019, Manfred Spraul wrote:
>Invalid would be:
>	smp_mb__before_atomic();
>	atomic_set();

fyi I've caught a couple of naughty users:

   drivers/crypto/cavium/nitrox/nitrox_main.c
   drivers/gpu/drm/msm/adreno/a5xx_preempt.c

Thanks,
Davidlohr