linux-kernel - Re: [patch 05/10] x86

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Message-ID: <20071130111142.GC32431@elte.hu>
Date:	Fri, 30 Nov 2007 12:11:42 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	tglx@...utronix.de, mingo@...hat.com
Subject: Re: [patch 05/10] x86_64: Use generic percpu


had rejects - hand-merged to x86.git - please check.

	Ingo

---------------->
Subject: x86_64: Use generic percpu
From: Christoph Lameter <clameter@....com>

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@...tcorp.com.au>
Cc: Andi Kleen <ak@...e.de>
Signed-off-by: Christoph Lameter <clameter@....com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/asm-x86/percpu_64.h |   28 +++-------------------------
 1 file changed, 3 insertions(+), 25 deletions(-)

Index: linux-x86.q/include/asm-x86/percpu_64.h
===================================================================
--- linux-x86.q.orig/include/asm-x86/percpu_64.h
+++ linux-x86.q/include/asm-x86/percpu_64.h
@@ -8,25 +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()); }))
-
 /* A macro to avoid #include hell... */
 #define percpu_modcopy(pcpudst, src, size)			\
 do {								\
@@ -36,16 +24,6 @@ do {								\
 		       (src), (size));				\
 } while (0)
 
-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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