From: David Matlack <dmatl...@google.com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
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 <dmatl...@google.com>
Acked-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Jiri Slaby <jsl...@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
