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 Cc: Andi Kleen Cc: tglx@linutronix.de Cc: mingo@redhat.com Signed-off-by: Christoph Lameter --- include/asm-x86/percpu_64.h | 28 +++------------------------- 1 file changed, 3 insertions(+), 25 deletions(-) Index: linux-2.6.24-rc3-mm2/include/asm-x86/percpu_64.h =================================================================== --- linux-2.6.24-rc3-mm2.orig/include/asm-x86/percpu_64.h 2007-11-28 12:51:42.452213062 -0800 +++ linux-2.6.24-rc3-mm2/include/asm-x86/percpu_64.h 2007-11-28 12:51:50.496213423 -0800 @@ -8,35 +8,13 @@ from %gs */ #ifdef CONFIG_SMP - #include #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 #endif /* _ASM_X8664_PERCPU_H_ */ -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/