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authorFrederic Weisbecker <fweisbec@gmail.com>2016-03-24 15:38:00 +0100
committerIngo Molnar <mingo@kernel.org>2016-03-29 11:52:11 +0200
commitf009a7a767e792d5ab0b46c08d46236ea5271dd9 (patch)
tree68a22ef0eee00723de6f05e9f8b0d68eeacd195f /kernel/time/tick-sched.h
parent5acba71e18833b9d06686b3751598bfa263a3ac3 (diff)
downloadlinux-f009a7a767e792d5ab0b46c08d46236ea5271dd9.tar.bz2
timers/nohz: Convert tick dependency mask to atomic_t
The tick dependency mask was intially unsigned long because this is the type on which clear_bit() operates on and fetch_or() accepts it. But now that we have atomic_fetch_or(), we can instead use atomic_andnot() to clear the bit. This consolidates the type of our tick dependency mask, reduce its size on structures and benefit from possible architecture optimizations on atomic_t operations. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1458830281-4255-3-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time/tick-sched.h')
-rw-r--r--kernel/time/tick-sched.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/tick-sched.h b/kernel/time/tick-sched.h
index eb4e32566a83..bf38226e5c17 100644
--- a/kernel/time/tick-sched.h
+++ b/kernel/time/tick-sched.h
@@ -60,7 +60,7 @@ struct tick_sched {
u64 next_timer;
ktime_t idle_expires;
int do_timer_last;
- unsigned long tick_dep_mask;
+ atomic_t tick_dep_mask;
};
extern struct tick_sched *tick_get_tick_sched(int cpu);