diff options
author | Christoph Lameter <cl@linux.com> | 2010-12-08 10:22:55 -0500 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2010-12-17 09:07:19 -0500 |
commit | 909ea96468096b07fbb41aaf69be060d92bd9271 (patch) | |
tree | a7e015edd96b5f674874fe78cdd889769e130a2a /kernel/hrtimer.c | |
parent | 780f36d8b3fa9572f731d4fb85067b2e45e6f993 (diff) |
core: Replace __get_cpu_var with __this_cpu_read if not used for an address.
__get_cpu_var() can be replaced with this_cpu_read and will then use a
single read instruction with implied address calculation to access the
correct per cpu instance.
However, the address of a per cpu variable passed to __this_cpu_read()
cannot be determined (since it's an implied address conversion through
segment prefixes). Therefore apply this only to uses of __get_cpu_var
where the address of the variable is not used.
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Hugh Dickins <hughd@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/hrtimer.c')
-rw-r--r-- | kernel/hrtimer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index 72206cf5c6c..29de5ae4ca9 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c | |||
@@ -497,7 +497,7 @@ static inline int hrtimer_is_hres_enabled(void) | |||
497 | */ | 497 | */ |
498 | static inline int hrtimer_hres_active(void) | 498 | static inline int hrtimer_hres_active(void) |
499 | { | 499 | { |
500 | return __get_cpu_var(hrtimer_bases).hres_active; | 500 | return __this_cpu_read(hrtimer_bases.hres_active); |
501 | } | 501 | } |
502 | 502 | ||
503 | /* | 503 | /* |