Messages in this thread Patch in this message | | | From | Jiri Slaby <> | Subject | [PATCH 3.12 151/235] jump_labels: API for flushing deferred jump label updates | Date | Fri, 27 Jan 2017 11:54:44 +0100 |
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From: David Matlack <dmatlack@google.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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commit b6416e61012429e0277bd15a229222fd17afc1c1 upstream.
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.
[js] no STATIC_KEY_CHECK_USE in 3.12 -> remove it
Signed-off-by: David Matlack <dmatlack@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- include/linux/jump_label_ratelimit.h | 4 ++++ kernel/jump_label.c | 6 ++++++ 2 files changed, 10 insertions(+)
diff --git a/include/linux/jump_label_ratelimit.h b/include/linux/jump_label_ratelimit.h index 113788389b3d..3f66ce8f0819 100644 --- a/include/linux/jump_label_ratelimit.h +++ b/include/linux/jump_label_ratelimit.h @@ -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); @@ -25,6 +26,9 @@ static inline void static_key_slow_dec_deferred(struct static_key_deferred *key) { static_key_slow_dec(&key->key); } +static inline void static_key_deferred_flush(struct static_key_deferred *key) +{ +} static inline void jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl) diff --git a/kernel/jump_label.c b/kernel/jump_label.c index 297a9247a3b3..9ce813e99a56 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -113,6 +113,12 @@ 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) +{ + 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) { -- 2.11.0
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