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authorChristoph Lameter <cl@linux.com>2010-12-06 11:16:24 -0600
committerTejun Heo <tj@kernel.org>2010-12-17 15:07:18 +0100
commit4a6f4fe8377720e5a279fdbb769946c242e936d3 (patch)
tree9684b9d39fe8b3aa620465ca0a51e4aacbfdd633 /drivers/cpuidle
parent12938a9220a38d555e38dc9b40021e664b99a1f1 (diff)
downloadlinux-4a6f4fe8377720e5a279fdbb769946c242e936d3.tar.bz2
drivers: 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 determed (since its an implied address conversion through segment prefixes). Therefore apply this only to uses of __get_cpu_var where the addres of the variable is not used. V3->V4: - Move one instance of this_cpu_inc_return to a later patch so that this one can go in without percpu infrastructrure changes. Sedat: fixed compile failure caused by an extra ')'. Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Sedat Dilek <sedat.dilek@gmail.com> 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 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index a50710843378..978ff292a3fa 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -49,7 +49,7 @@ static int __cpuidle_register_device(struct cpuidle_device *dev);
*/
static void cpuidle_idle_call(void)
{
- struct cpuidle_device *dev = __get_cpu_var(cpuidle_devices);
+ struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices);
struct cpuidle_state *target_state;
int next_state;