Commit cf4c950b authored by Eric Biggers's avatar Eric Biggers Committed by David S. Miller

once: switch to new jump label API

Switch the DO_ONCE() macro from the deprecated jump label API to the new
one.  The new one is more readable, and for DO_ONCE() it also makes the
generated code more icache-friendly: now the one-time initialization
code is placed out-of-line at the jump target, rather than at the inline
fallthrough case.
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d93fa2ba
......@@ -5,7 +5,7 @@
#include <linux/jump_label.h>
bool __do_once_start(bool *done, unsigned long *flags);
void __do_once_done(bool *done, struct static_key *once_key,
void __do_once_done(bool *done, struct static_key_true *once_key,
unsigned long *flags);
/* Call a function exactly once. The idea of DO_ONCE() is to perform
......@@ -38,8 +38,8 @@ void __do_once_done(bool *done, struct static_key *once_key,
({ \
bool ___ret = false; \
static bool ___done = false; \
static struct static_key ___once_key = STATIC_KEY_INIT_TRUE; \
if (static_key_true(&___once_key)) { \
static DEFINE_STATIC_KEY_TRUE(___once_key); \
if (static_branch_unlikely(&___once_key)) { \
unsigned long ___flags; \
___ret = __do_once_start(&___done, &___flags); \
if (unlikely(___ret)) { \
......
......@@ -5,7 +5,7 @@
struct once_work {
struct work_struct work;
struct static_key *key;
struct static_key_true *key;
};
static void once_deferred(struct work_struct *w)
......@@ -14,11 +14,11 @@ static void once_deferred(struct work_struct *w)
work = container_of(w, struct once_work, work);
BUG_ON(!static_key_enabled(work->key));
static_key_slow_dec(work->key);
static_branch_disable(work->key);
kfree(work);
}
static void once_disable_jump(struct static_key *key)
static void once_disable_jump(struct static_key_true *key)
{
struct once_work *w;
......@@ -51,7 +51,7 @@ bool __do_once_start(bool *done, unsigned long *flags)
}
EXPORT_SYMBOL(__do_once_start);
void __do_once_done(bool *done, struct static_key *once_key,
void __do_once_done(bool *done, struct static_key_true *once_key,
unsigned long *flags)
__releases(once_lock)
{
......
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