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Commit 677243d7 authored by Brian Gerst's avatar Brian Gerst Committed by Tejun Heo
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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: default avatarBrian Gerst <brgerst@gmail.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent db7829c6

include/asm-generic/percpu.h

+3 −4
Original line number Diff line number Diff line
@@ -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