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Commit 072a1e69 authored by travis@sgi.com's avatar travis@sgi.com Committed by Ingo Molnar
Browse files

x86: use generic percpu on 64-bit 



x86_64 provides an optimized way to determine the local per cpu area
offset through the pda and determines the base by accessing a remote
pda.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 0af8a5cc

include/asm-x86/percpu_64.h

+2 −21
Original line number Diff line number Diff line
@@ -12,21 +12,10 @@ 
#include <asm/pda.h>



#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)

#define __my_cpu_offset() read_pda(data_offset)

#define __my_cpu_offset read_pda(data_offset)



#define per_cpu_offset(x) (__per_cpu_offset(x))



/* var is in discarded region: offset to particular copy we want */

#define per_cpu(var, cpu) (*({				\

	extern int simple_identifier_##var(void);	\

	RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)); }))

#define __get_cpu_var(var) (*({				\

	extern int simple_identifier_##var(void);	\

	RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))

#define __raw_get_cpu_var(var) (*({			\

	extern int simple_identifier_##var(void);	\

	RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))



/* A macro to avoid #include hell... */

#define percpu_modcopy(pcpudst, src, size)			\

do {								\
@@ -36,16 +25,8 @@ do { \ 
		       (src), (size));				\

} while (0)



extern void setup_per_cpu_areas(void);



#else /* ! SMP */



#define per_cpu(var, cpu)			(*((void)(cpu), &per_cpu__##var))

#define __get_cpu_var(var)			per_cpu__##var

#define __raw_get_cpu_var(var)			per_cpu__##var



#endif	/* SMP */



#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name

#include <asm-generic/percpu.h>



#endif /* _ASM_X8664_PERCPU_H_ */