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| author | Christoph Lameter <cl@linux.com> | 2010-12-06 11:16:24 -0600 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2010-12-17 15:07:18 +0100 |
| commit | 4a6f4fe8377720e5a279fdbb769946c242e936d3 (patch) | |
| tree | 9684b9d39fe8b3aa620465ca0a51e4aacbfdd633 /drivers/cpuidle | |
| parent | 12938a9220a38d555e38dc9b40021e664b99a1f1 (diff) | |
| download | linux-3.10-4a6f4fe8377720e5a279fdbb769946c242e936d3.tar.gz linux-3.10-4a6f4fe8377720e5a279fdbb769946c242e936d3.tar.bz2 linux-3.10-4a6f4fe8377720e5a279fdbb769946c242e936d3.zip | |
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.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index a5071084337..978ff292a3f 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; |