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    Subject[PATCH 05/10] x86_64: Use generic percpu
    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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