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Commit b6416e61 authored by David Matlack's avatar David Matlack Committed by Paolo Bonzini
Browse files

jump_labels: API for flushing deferred jump label updates 



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: default avatarDavid Matlack <dmatlack@google.com>
Cc: stable@vger.kernel.org
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent a121103c

include/linux/jump_label_ratelimit.h

+5 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ struct static_key_deferred { 


#ifdef HAVE_JUMP_LABEL

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

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_slow_dec(&key->key);

}

static inline void static_key_deferred_flush(struct static_key_deferred *key)

{

	STATIC_KEY_CHECK_USE();

}

static inline void

jump_label_rate_limit(struct static_key_deferred *key,

		unsigned long rl)

kernel/jump_label.c

+7 −0
Original line number Diff line number Diff line
@@ -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)

{