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Date: Wed, 18 Nov 2015 09:34:59 +0900 From: <byungchul.park@....com> To: <mingo@...nel.org>, <peterz@...radead.org> CC: linux-kernel@...r.kernel.org, efault@....de, tglx@...utronix.de, yuyang.du@...el.com, pjt@...gle.com, Byungchul Park <byungchul.park@....com> Subject: [PATCH] sched: modify the comment about lock assumption in migrate_task_rq_fair() From: Byungchul Park <byungchul.park@....com> The comment describing migrate_task_rq_fair() says that the caller should hold p->pi_lock. But in some other case, the caller can hold task_rq(p)->lock instead of p->pi_lock. So the comment is broken and this patch fixs it. Signed-off-by: Byungchul Park <byungchul.park@....com> --- kernel/sched/fair.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 077076f..6f43dfd 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5006,8 +5006,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f /* * Called immediately before a task is migrated to a new cpu; task_cpu(p) and * cfs_rq_of(p) references at time of call are still valid and identify the - * previous cpu. However, the caller only guarantees p->pi_lock is held; no - * other assumptions, including the state of rq->lock, should be made. + * previous cpu. The caller guarantees p->pi_lock or task_rq(p)->lock is held. */ static void migrate_task_rq_fair(struct task_struct *p, int next_cpu) { -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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