linux-kernel - Re: [PATCH 3/5] sched/deadline: Fix wrong cpudl_find() in check_preempt_equal

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Message-ID: <20150127164716.GH21418@twins.programming.kicks-ass.net>
Date:	Tue, 27 Jan 2015 17:47:16 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Xunlei Pang <pang.xunlei@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Juri Lelli <juri.lelli@...il.com>
Subject: Re: [PATCH 3/5] sched/deadline: Fix wrong cpudl_find() in
 check_preempt_equal_dl()

On Mon, Jan 19, 2015 at 04:49:38AM +0000, Xunlei Pang wrote:
> In check_preempt_equal_dl(), cpudl_find() is called with a NULL
> later_mask, thus cpudl_find() here doesn't check cpudl::free_cpus
> at all.
> 
> This patch takles this issue by always passing a non-NULL later_mask
> to cpudl_find(), thereby fixing this issue.

Fix what issue? Afaict this is an optimization not a fix.
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