[patch 09/14] x86_64: Use generic percpu

[Christoph Lameter]

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@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: tglx@xxxxxxxxxxxxx
Cc: mingo@xxxxxxxxxx
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>

---
 include/asm-x86/percpu_64.h |   28 +++-------------------------
 1 file changed, 3 insertions(+), 25 deletions(-)

Index: linux-2.6/include/asm-x86/percpu_64.h
===================================================================
--- linux-2.6.orig/include/asm-x86/percpu_64.h	2007-11-24 10:27:31.088350556 -0800
+++ linux-2.6/include/asm-x86/percpu_64.h	2007-11-24 10:28:51.020600562 -0800
@@ -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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