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/s390 | |
| parent | 12938a9220a38d555e38dc9b40021e664b99a1f1 (diff) | |
| download | kernel_samsung_smdk4412-4a6f4fe8377720e5a279fdbb769946c242e936d3.tar.gz kernel_samsung_smdk4412-4a6f4fe8377720e5a279fdbb769946c242e936d3.tar.bz2 kernel_samsung_smdk4412-4a6f4fe8377720e5a279fdbb769946c242e936d3.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/s390')
| -rw-r--r-- | drivers/s390/cio/cio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index f4e6cf3aceb..430f875006f 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -619,7 +619,7 @@ void __irq_entry do_IRQ(struct pt_regs *regs) s390_idle_check(regs, S390_lowcore.int_clock, S390_lowcore.async_enter_timer); irq_enter(); - __get_cpu_var(s390_idle).nohz_delay = 1; + __this_cpu_write(s390_idle.nohz_delay, 1); if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) /* Serve timer interrupts first. */ clock_comparator_work(); |