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once: switch to new jump label API

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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: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Biggers
2017-10-09 14:30:52 -07:00
committed by David S. Miller
parent d93fa2ba64
commit cf4c950b87
2 changed files with 7 additions and 7 deletions
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8
lib/once.c
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@@ -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)
{