ia64 has a special processor specific mapping that can be used to locate the offset for the current per cpu area.
Cc: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Signed-off-by: Christoph Lameter <[EMAIL PROTECTED]> --- include/asm-ia64/percpu.h | 24 ++++++++---------------- 1 file changed, 8 insertions(+), 16 deletions(-) Index: linux-2.6/include/asm-ia64/percpu.h =================================================================== --- linux-2.6.orig/include/asm-ia64/percpu.h 2007-11-24 10:27:31.088350556 -0800 +++ linux-2.6/include/asm-ia64/percpu.h 2007-11-24 10:31:54.053187674 -0800 @@ -9,10 +9,9 @@ #define PERCPU_ENOUGH_ROOM PERCPU_PAGE_SIZE #ifdef __ASSEMBLY__ -# define THIS_CPU(var) (per_cpu__##var) /* use this to mark accesses to per-CPU variables... */ +# define THIS_CPU(var) (PERCPU_ADDR + per_cpu__##var) /* use this to mark accesses to per-CPU variables... */ #else /* !__ASSEMBLY__ */ - #include <linux/threads.h> #define DECLARE_PER_CPU(type, name) \ @@ -20,24 +19,12 @@ #ifdef CONFIG_SMP -extern unsigned long __per_cpu_offset[NR_CPUS]; -#define per_cpu_offset(x) (__per_cpu_offset[x]) - -/* Equal to __per_cpu_offset[smp_processor_id()], but faster to access: */ -DECLARE_PER_CPU(unsigned long, local_per_cpu_offset); - -#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu])) -#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __ia64_per_cpu_var(local_per_cpu_offset))) -#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __ia64_per_cpu_var(local_per_cpu_offset))) +#define __my_cpu_offset __ia64_per_cpu_var(local_per_cpu_offset) -extern void setup_per_cpu_areas (void); extern void *per_cpu_init(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 #define per_cpu_init() (__phys_per_cpu_start) #endif /* SMP */ @@ -48,7 +35,12 @@ extern void *per_cpu_init(void); * On the positive side, using __ia64_per_cpu_var() instead of __get_cpu_var() is slightly * more efficient. */ -#define __ia64_per_cpu_var(var) (per_cpu__##var) +#define __ia64_per_cpu_var(var) (*SHIFT_PTR(&per_cpu__##var, PERCPU_ADDR)) + +#include <asm-generic/percpu.h> + +/* Equal to __per_cpu_offset[smp_processor_id()], but faster to access: */ +DECLARE_PER_CPU(unsigned long, local_per_cpu_offset); #endif /* !__ASSEMBLY__ */ -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
