Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 30 Dec 2019 18:39:44 +0100
From:   Frederic Weisbecker <frederic@kernel.org>
To:     Chris Wilson <chris@chris-wilson.co.uk>
Cc:     linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH] sched/vtime: Prevent unstable evaluation of
 WARN(vtime->state)
Message-ID: <20191230173943.GA12625@lenoir>
References: <20191230010839.GA8740@lenoir>
 <20191230090436.3749235-1-chris@chris-wilson.co.uk>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20191230090436.3749235-1-chris@chris-wilson.co.uk>
User-Agent: Mutt/1.9.4 (2018-02-28)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Dec 30, 2019 at 09:04:36AM +0000, Chris Wilson wrote:
> As the vtime is sampled under loose seqcount protection by kcpustat, the
> vtime fields may change as the code flows. Where logic dictates a field
> has a static value, use a READ_ONCE.
> 
> Fixes: 74722bb223d0 ("sched/vtime: Bring up complete kcpustat accessor")
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Frederic Weisbecker <frederic@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@kernel.org>

Oh thanks for taking the time to make it a proper patch!
Looks good, I'm relaying it.