diff options
| 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/acpi | |
| parent | 12938a9220a38d555e38dc9b40021e664b99a1f1 (diff) | |
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/acpi')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index dcb38f8ddfda..a765b823aa9e 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -746,7 +746,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, struct acpi_processor *pr; struct acpi_processor_cx *cx = cpuidle_get_statedata(state); - pr = __get_cpu_var(processors); + pr = __this_cpu_read(processors); if (unlikely(!pr)) return 0; @@ -787,7 +787,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev, s64 idle_time_ns; s64 idle_time; - pr = __get_cpu_var(processors); + pr = __this_cpu_read(processors); if (unlikely(!pr)) return 0; @@ -864,7 +864,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, s64 idle_time; - pr = __get_cpu_var(processors); + pr = __this_cpu_read(processors); if (unlikely(!pr)) return 0; |