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authorChristoph Lameter <cl@linux.com>2010-12-08 16:22:55 +0100
committerTejun Heo <tj@kernel.org>2010-12-17 15:07:19 +0100
commit909ea96468096b07fbb41aaf69be060d92bd9271 (patch)
treea7e015edd96b5f674874fe78cdd889769e130a2a /kernel/hrtimer.c
parent780f36d8b3fa9572f731d4fb85067b2e45e6f993 (diff)
downloadlinux-909ea96468096b07fbb41aaf69be060d92bd9271.tar.gz
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.c2
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)
*/
static inline int hrtimer_hres_active(void)
{
- return __get_cpu_var(hrtimer_bases).hres_active;
+ return __this_cpu_read(hrtimer_bases.hres_active);
}
/*