Messages in this thread Patch in this message | | | From | Ben Hutchings <> | Date | Fri, 10 Mar 2017 11:46:23 +0000 | Subject | [PATCH 3.16 219/370] jump_labels: API for flushing deferred jump label updates |
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3.16.42-rc1 review patch. If anyone has any objections, please let me know.
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From: David Matlack <dmatlack@google.com>
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.
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: Ben Hutchings <ben@decadent.org.uk> --- include/linux/jump_label_ratelimit.h | 5 +++++ kernel/jump_label.c | 7 +++++++ 2 files changed, 12 insertions(+)
--- 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); @@ -26,6 +27,10 @@ static inline void static_key_slow_dec_d 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) --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -116,6 +116,13 @@ void static_key_slow_dec_deferred(struct } 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) {
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