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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>
This commit is contained in:
Mel Gorman 2014-06-04 16:10:07 -07:00 committed by Linus Torvalds
parent 800a1e750c
commit ea5e9539ab
1 changed files with 13 additions and 7 deletions
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20
include/linux/jump_label.h
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@ -69,6 +69,10 @@ struct static_key {
# include <asm/jump_label.h> # include <asm/jump_label.h>
# define HAVE_JUMP_LABEL # define HAVE_JUMP_LABEL
#else
struct static_key {
atomic_t enabled;
};
#endif /* CC_HAVE_ASM_GOTO && CONFIG_JUMP_LABEL */ #endif /* CC_HAVE_ASM_GOTO && CONFIG_JUMP_LABEL */
enum jump_label_type { enum jump_label_type {
@ -79,6 +83,12 @@ enum jump_label_type {
struct module; struct module;
#include <linux/atomic.h> #include <linux/atomic.h>
static inline int static_key_count(struct static_key *key)
{
return atomic_read(&key->enabled);
}
#ifdef HAVE_JUMP_LABEL #ifdef HAVE_JUMP_LABEL
#define JUMP_LABEL_TYPE_FALSE_BRANCH 0UL #define JUMP_LABEL_TYPE_FALSE_BRANCH 0UL
@ -134,10 +144,6 @@ extern void jump_label_apply_nops(struct module *mod);
#else /* !HAVE_JUMP_LABEL */ #else /* !HAVE_JUMP_LABEL */
struct static_key {
atomic_t enabled;
};
static __always_inline void jump_label_init(void) static __always_inline void jump_label_init(void)
{ {
static_key_initialized = true; static_key_initialized = true;
@ -145,14 +151,14 @@ static __always_inline void jump_label_init(void)
static __always_inline bool static_key_false(struct static_key *key) 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 true;
return false; return false;
} }
static __always_inline bool static_key_true(struct static_key *key) 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 true;
return false; return false;
} }
@ -194,7 +200,7 @@ static inline int jump_label_apply_nops(struct module *mod)
static inline bool static_key_enabled(struct static_key *key) 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 */ #endif /* _LINUX_JUMP_LABEL_H */