lkml.org 
[lkml]   [2015]   [Nov]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] sched: modify the comment about lock assumption in migrate_task_rq_fair()
Date
From: Byungchul Park <byungchul.park@lge.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@lge.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


\
 
 \ /
  Last update: 2015-11-18 02:01    [W:0.164 / U:0.552 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site