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percpu: Optimize __get_cpu_var() 

Redefine __get_cpu_var() using this_cpu_ptr() which can be
arch-optimized.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Brian Gerst 2010-09-09 18:17:26 +02:00 committed by Tejun Heo
parent db7829c6cc
commit 677243d749
1 changed files with 3 additions and 4 deletions
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7
include/asm-generic/percpu.h
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@ -55,10 +55,6 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
*/
#define per_cpu(var, cpu) \
(*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu)))
#define __get_cpu_var(var) \
(*SHIFT_PERCPU_PTR(&(var), my_cpu_offset))
#define __raw_get_cpu_var(var) \
(*SHIFT_PERCPU_PTR(&(var), __my_cpu_offset))
#ifndef __this_cpu_ptr
#define __this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
@ -69,6 +65,9 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
#define this_cpu_ptr(ptr) __this_cpu_ptr(ptr)
#endif
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
#define __raw_get_cpu_var(var) (*__this_cpu_ptr(&(var)))
#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
extern void setup_per_cpu_areas(void);
#endif