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drivers: Replace __get_cpu_var with __this_cpu_read if not used for an address.

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__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 <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Sedat Dilek <[email protected]>
Acked-by: H. Peter Anvin <[email protected]>
Signed-off-by: Christoph Lameter <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Christoph Lameter 2010-12-06 11:16:24 -06:00 • committed by Tejun Heo
commit 4a6f4fe837
4 changed files with 7 additions and 7 deletions
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2
drivers/cpuidle/cpuidle.c
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@ -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;