jump_label: make static_key_enabled() work on static_key_true/false types too

static_key_enabled() can be used on struct static_key but not on its
wrapper types static_key_true and static_key_false.  The function is
useful for debugging and management of static keys.  Update it so that
it can be used for the wrapper types too.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 7f653e8..c9ca050 100644 (file)
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -216,11 +216,6 @@ static inline int jump_label_apply_nops(struct module *mod)
 #define STATIC_KEY_INIT STATIC_KEY_INIT_FALSE
 #define jump_label_enabled static_key_enabled
 
-static inline bool static_key_enabled(struct static_key *key)
-{
-       return static_key_count(key) > 0;
-}
-
 static inline void static_key_enable(struct static_key *key)
 {
        int count = static_key_count(key);
@@ -267,6 +262,17 @@ struct static_key_false {
 #define DEFINE_STATIC_KEY_FALSE(name)  \
        struct static_key_false name = STATIC_KEY_FALSE_INIT
 
+extern bool ____wrong_branch_error(void);
+
+#define static_key_enabled(x)                                                  \
+({                                                                             \
+       if (!__builtin_types_compatible_p(typeof(*x), struct static_key) &&     \
+           !__builtin_types_compatible_p(typeof(*x), struct static_key_true) &&\
+           !__builtin_types_compatible_p(typeof(*x), struct static_key_false)) \
+               ____wrong_branch_error();                                       \
+       static_key_count((struct static_key *)x) > 0;                           \
+})
+
 #ifdef HAVE_JUMP_LABEL
 
 /*
@@ -325,8 +331,6 @@ struct static_key_false {
  * See jump_label_type() / jump_label_init_type().
  */
 
-extern bool ____wrong_branch_error(void);
-
 #define static_branch_likely(x)                                                        \
 ({                                                                             \
        bool branch;                                                            \