linux-kernel - Re: [patch 04/10] x86_32: Use generic percpu.h

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Date:	Fri, 30 Nov 2007 12:11:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, mingo@...hat.com, ak@...e.de
Subject: Re: [patch 04/10] x86_32: Use generic percpu.h


merge to x86.git below. Please check.

	Ingo

---->
Subject: x86_32: Use generic percpu.h
From: Christoph Lameter <clameter@....com>

x86_32 only provides a special way to obtain the local per cpu area offset
via x86_read_percpu. Otherwise it can fully use the generic handling.

Cc: 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_32.h |   30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

Index: linux-x86.q/include/asm-x86/percpu_32.h
===================================================================
--- linux-x86.q.orig/include/asm-x86/percpu_32.h
+++ linux-x86.q/include/asm-x86/percpu_32.h
@@ -42,26 +42,7 @@
  */
 #ifdef CONFIG_SMP
 
-/* This is used for other cpus to find our section. */
-extern unsigned long __per_cpu_offset[];
-
-#define per_cpu_offset(x) (__per_cpu_offset[x])
-
-#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
-/* We can use this directly for local CPU (faster). */
-DECLARE_PER_CPU(unsigned long, this_cpu_off);
-
-/* var is in discarded region: offset to particular copy we want */
-#define per_cpu(var, cpu) (*({				\
-	extern int simple_indentifier_##var(void);	\
-	RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
-
-#define __raw_get_cpu_var(var) (*({					\
-	extern int simple_indentifier_##var(void);			\
-	RELOC_HIDE(&per_cpu__##var, x86_read_percpu(this_cpu_off));	\
-}))
-
-#define __get_cpu_var(var) __raw_get_cpu_var(var)
+#define __my_cpu_offset x86_read_percpu(this_cpu_off)
 
 /* A macro to avoid #include hell... */
 #define percpu_modcopy(pcpudst, src, size)			\
@@ -74,11 +55,18 @@ do {								\
 
 /* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
 #define __percpu_seg "%%fs:"
+
 #else  /* !SMP */
-#include <asm-generic/percpu.h>
+
 #define __percpu_seg ""
+
 #endif	/* SMP */
 
+#include <asm-generic/percpu.h>
+
+/* We can use this directly for local CPU (faster). */
+DECLARE_PER_CPU(unsigned long, this_cpu_off);
+
 /* For arch-specific code, we can use direct single-insn ops (they
  * don't give an lvalue though). */
 extern void __bad_percpu_size(void);
-
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