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timers/nohz: Convert tick dependency mask to atomic_t

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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>
This commit is contained in:
Frederic Weisbecker
2016-03-24 15:38:00 +01:00
committed by Ingo Molnar
parent 5acba71e18
commit f009a7a767
3 changed files with 33 additions and 34 deletions
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kernel/time/tick-sched.h
+1 -1
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@@ -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);