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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2016-03-24 15:38:00 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-03-29 11:52:11 +0200 |
| commit | f009a7a767e792d5ab0b46c08d46236ea5271dd9 (patch) | |
| tree | 68a22ef0eee00723de6f05e9f8b0d68eeacd195f /kernel/time/tick-sched.h | |
| parent | 5acba71e18833b9d06686b3751598bfa263a3ac3 (diff) | |
| download | linux-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.h | 2 |
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); |