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Date: Thu, 8 Aug 2013 18:41:25 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Zhu Yanhai <gaoyang.zyh@...bao.com>, Peter Zijlstra <peterz@...radead.org>, Paul Turner <pjt@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Steven Rostedt <rostedt@...dmis.org>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Ingo Molnar <mingo@...nel.org> Subject: [ 09/22] sched: Fix the broken sched_rr_get_interval() 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhu Yanhai <gaoyang.zyh@...bao.com> commit a59f4e079d19464eebb9b06513a1d4f55fdae5ba upstream. The caller of sched_sliced() should pass se.cfs_rq and se as the arguments, however in sched_rr_get_interval() we gave it rq.cfs_rq and se, which made the following computation obviously wrong. The change was introduced by commit: 77034937dc45 sched: fix crash in sys_sched_rr_get_interval() ... 5 years ago, while it had been the correct 'cfs_rq_of' before the commit. The change seems to be irrelevant to the commit msg, which was to return a 0 timeslice for tasks that are on an idle runqueue. So I believe that was just a plain typo. Signed-off-by: Zhu Yanhai <gaoyang.zyh@...bao.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Paul Turner <pjt@...gle.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Steven Rostedt <rostedt@...dmis.org> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Link: http://lkml.kernel.org/r/1357621012-15039-1-git-send-email-gaoyang.zyh@taobao.com [ Since this is an ABI and an old bug, we'll test this via a slow upstream route, to hopefully discover any app breakage. ] Signed-off-by: Ingo Molnar <mingo@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- kernel/sched_fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -4277,7 +4277,7 @@ static unsigned int get_rr_interval_fair * idle runqueue: */ if (rq->cfs.load.weight) - rr_interval = NS_TO_JIFFIES(sched_slice(&rq->cfs, se)); + rr_interval = NS_TO_JIFFIES(sched_slice(cfs_rq_of(se), se)); return rr_interval; } -- 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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