Messages in this thread Patch in this message | | | Date | Thu, 27 Dec 2007 16:16:22 -0800 | From | travis@sgi ... | Subject | [PATCH 05/10] x86_64: Use generic percpu |
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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> Cc: tglx@linutronix.de Cc: mingo@redhat.com Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Mike Travis <travis@sgi.com>
--- include/asm-x86/percpu_64.h | 28 +++------------------------- 1 file changed, 3 insertions(+), 25 deletions(-)
--- a/include/asm-x86/percpu_64.h +++ b/include/asm-x86/percpu_64.h @@ -8,35 +8,13 @@ from %gs */ #ifdef CONFIG_SMP - #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()); })) - -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 - +#endif +#include <asm-generic/percpu.h> #endif /* _ASM_X8664_PERCPU_H_ */ --
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