From 6ac29178b4fe8e7c0139375008f014ceb466039d Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Sun, 21 Apr 2013 20:28:38 +0200
Subject: [PATCH] posix_timers: Fix pre-condition to stop the tick on full
 dynticks

The test that checks if a CPU can stop its tick from posix CPU
timers angle was mistakenly inverted.

What we want is to prevent the tick from being stopped as long
as the current CPU's task runs a posix CPU timer.

Fix this.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/posix-cpu-timers.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 84d5cb372ed5..42670e9b44e0 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -673,12 +673,12 @@ static void posix_cpu_timer_kick_nohz(void)
 bool posix_cpu_timers_can_stop_tick(struct task_struct *tsk)
 {
 	if (!task_cputime_zero(&tsk->cputime_expires))
-		return true;
+		return false;
 
 	if (tsk->signal->cputimer.running)
-		return true;
+		return false;
 
-	return false;
+	return true;
 }
 #else
 static inline void posix_cpu_timer_kick_nohz(void) { }
-- 
2.39.5