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jump_labels: API for flushing deferred jump label updates

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Modules that use static_key_deferred need a way to synchronize with
any delayed work that is still pending when the module is unloaded.
Introduce static_key_deferred_flush() which flushes any pending
jump label updates.

Signed-off-by: David Matlack <[email protected]>
Cc: [email protected]
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
David Matlack 2016-12-16 14:30:35 -08:00 • committed by Paolo Bonzini
commit b6416e6101
2 changed files with 12 additions and 0 deletions
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7
kernel/jump_label.c
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@ -182,6 +182,13 @@ void static_key_slow_dec_deferred(struct static_key_deferred *key)
}
EXPORT_SYMBOL_GPL(static_key_slow_dec_deferred);
void static_key_deferred_flush(struct static_key_deferred *key)
{
STATIC_KEY_CHECK_USE();
flush_delayed_work(&key->work);
}
EXPORT_SYMBOL_GPL(static_key_deferred_flush);
void jump_label_rate_limit(struct static_key_deferred *key,
unsigned long rl)
{