linux-kernel - [GIT pull] scheduler updates for 4.4

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Message-ID: <alpine.DEB.2.11.1511150901190.3761@nanos>
Date:	Sun, 15 Nov 2015 09:03:11 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [GIT pull] scheduler updates for 4.4

Linus,

please pull the latest sched-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-for-linus

A single fix to prevent math underflow in the numa balancing code.

Thanks,

	tglx

------------------>
Rik van Riel (1):
      sched/numa: Fix math underflow in task_tick_numa()


 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 824aa9f501a3..f04fda8f669c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2302,7 +2302,7 @@ void task_tick_numa(struct rq *rq, struct task_struct *curr)
 	now = curr->se.sum_exec_runtime;
 	period = (u64)curr->numa_scan_period * NSEC_PER_MSEC;
 
-	if (now - curr->node_stamp > period) {
+	if (now > curr->node_stamp + period) {
 		if (!curr->node_stamp)
 			curr->numa_scan_period = task_scan_min(curr);
 		curr->node_stamp += period;
--
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