include/linux/jump_label.h: expose the reference count
This patch exposes the jump_label reference count in preparation for the
next patch. cpusets cares about both the jump_label being enabled and how
many users of the cpusets there currently are.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 5c1dfb2..784304b 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -69,6 +69,10 @@
# include <asm/jump_label.h>
# define HAVE_JUMP_LABEL
+#else
+struct static_key {
+ atomic_t enabled;
+};
#endif /* CC_HAVE_ASM_GOTO && CONFIG_JUMP_LABEL */
enum jump_label_type {
@@ -79,6 +83,12 @@
struct module;
#include <linux/atomic.h>
+
+static inline int static_key_count(struct static_key *key)
+{
+ return atomic_read(&key->enabled);
+}
+
#ifdef HAVE_JUMP_LABEL
#define JUMP_LABEL_TYPE_FALSE_BRANCH 0UL
@@ -134,10 +144,6 @@
#else /* !HAVE_JUMP_LABEL */
-struct static_key {
- atomic_t enabled;
-};
-
static __always_inline void jump_label_init(void)
{
static_key_initialized = true;
@@ -145,14 +151,14 @@
static __always_inline bool static_key_false(struct static_key *key)
{
- if (unlikely(atomic_read(&key->enabled) > 0))
+ if (unlikely(static_key_count(key) > 0))
return true;
return false;
}
static __always_inline bool static_key_true(struct static_key *key)
{
- if (likely(atomic_read(&key->enabled) > 0))
+ if (likely(static_key_count(key) > 0))
return true;
return false;
}
@@ -194,7 +200,7 @@
static inline bool static_key_enabled(struct static_key *key)
{
- return (atomic_read(&key->enabled) > 0);
+ return static_key_count(key) > 0;
}
#endif /* _LINUX_JUMP_LABEL_H */