enum jump_label_type type);
extern void arch_jump_label_transform_apply(void);
extern int jump_label_text_reserved(void *start, void *end);
-extern void static_key_slow_inc(struct static_key *key);
+extern bool static_key_slow_inc(struct static_key *key);
+extern bool static_key_fast_inc_not_disabled(struct static_key *key);
extern void static_key_slow_dec(struct static_key *key);
-extern void static_key_slow_inc_cpuslocked(struct static_key *key);
+extern bool static_key_slow_inc_cpuslocked(struct static_key *key);
extern void static_key_slow_dec_cpuslocked(struct static_key *key);
extern int static_key_count(struct static_key *key);
extern void static_key_enable(struct static_key *key);
return false;
}
-static inline void static_key_slow_inc(struct static_key *key)
+static inline bool static_key_fast_inc_not_disabled(struct static_key *key)
{
+ int v;
+
STATIC_KEY_CHECK_USE(key);
- atomic_inc(&key->enabled);
+ /*
+ * Prevent key->enabled getting negative to follow the same semantics
+ * as for CONFIG_JUMP_LABEL=y, see kernel/jump_label.c comment.
+ */
+ v = atomic_read(&key->enabled);
+ do {
+ if (v < 0 || (v + 1) < 0)
+ return false;
+ } while (!likely(atomic_try_cmpxchg(&key->enabled, &v, v + 1)));
+ return true;
}
+#define static_key_slow_inc(key) static_key_fast_inc_not_disabled(key)
static inline void static_key_slow_dec(struct static_key *key)
{