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jump_label: Move CPU hotplug locking

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As we're about to rework the locking, let's move the taking and
release of the CPU hotplug lock to locations that will make its
reworking completely obvious.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20170801080257.5056-2-marc.zyngier@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Marc Zyngier 2017-08-01 09:02:54 +01:00 committed by Ingo Molnar
parent d0646a6f55
commit b70cecf4b6
1 changed files with 4 additions and 2 deletions
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6
kernel/jump_label.c
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@ -83,6 +83,7 @@ void static_key_slow_inc(struct static_key *key)
{
int v, v1;
cpus_read_lock();
STATIC_KEY_CHECK_USE();
/*
@ -99,11 +100,12 @@ void static_key_slow_inc(struct static_key *key)
*/
for (v = atomic_read(&key->enabled); v > 0; v = v1) {
v1 = atomic_cmpxchg(&key->enabled, v, v + 1);
if (likely(v1 == v))
if (likely(v1 == v)) {
cpus_read_unlock();
return;
}
}
cpus_read_lock();
jump_label_lock();
if (atomic_read(&key->enabled) == 0) {
atomic_set(&key->enabled, -1);