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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 <dmatlack@google.com>
Cc: stable@vger.kernel.org
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Matlack 2016-12-16 14:30:35 -08:00 committed by Paolo Bonzini
parent a121103c92
commit b6416e6101
2 changed files with 12 additions and 0 deletions
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5
include/linux/jump_label_ratelimit.h
View File

@ -14,6 +14,7 @@ struct static_key_deferred {
#ifdef HAVE_JUMP_LABEL #ifdef HAVE_JUMP_LABEL
extern void static_key_slow_dec_deferred(struct static_key_deferred *key); extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
extern void static_key_deferred_flush(struct static_key_deferred *key);
extern void extern void
jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl); jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
@ -26,6 +27,10 @@ static inline void static_key_slow_dec_deferred(struct static_key_deferred *key)
STATIC_KEY_CHECK_USE(); STATIC_KEY_CHECK_USE();
static_key_slow_dec(&key->key); static_key_slow_dec(&key->key);
} }
static inline void static_key_deferred_flush(struct static_key_deferred *key)
{
STATIC_KEY_CHECK_USE();
}
static inline void static inline void
jump_label_rate_limit(struct static_key_deferred *key, jump_label_rate_limit(struct static_key_deferred *key,
unsigned long rl) unsigned long rl)

7
kernel/jump_label.c
View File

@ -182,6 +182,13 @@ void static_key_slow_dec_deferred(struct static_key_deferred *key)
} }
EXPORT_SYMBOL_GPL(static_key_slow_dec_deferred); 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, void jump_label_rate_limit(struct static_key_deferred *key,
unsigned long rl) unsigned long rl)
{ {