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Date:   Fri, 14 Feb 2020 17:23:09 +0100
From:   Frederic Weisbecker <>
To:     Ingo Molnar <>,
        Peter Zijlstra <>
Cc:     LKML <>,
        Chris Wilson <>
Subject: Re: [PATCH] sched/vtime: Prevent unstable evaluation of

On Thu, Jan 23, 2020 at 07:08:49PM +0100, Frederic Weisbecker wrote:
> From: Chris Wilson <>
> 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 <>
> Cc: Peter Zijlstra <>
> Cc: Ingo Molnar <>
> Signed-off-by: Frederic Weisbecker <>


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