From: travis@sgi.com
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <clameter@sgi.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, mingo@redhat.com, ak@suse.de
Subject: [PATCH 04/10] x86_32: Use generic percpu.h
Date: Thu, 27 Dec 2007 16:16:21 -0800 [thread overview]
Message-ID: <20071228001618.155554000@sgi.com> (raw)
In-Reply-To: 20071228001617.597161000@sgi.com
[-- Attachment #1: x86_32_use_generic_percpu --]
[-- Type: text/plain, Size: 1847 bytes --]
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: tglx@linutronix.de
Cc: mingo@redhat.com
Cc: ak@suse.de
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
---
include/asm-x86/percpu_32.h | 30 +++++++++---------------------
1 file changed, 9 insertions(+), 21 deletions(-)
--- a/include/asm-x86/percpu_32.h
+++ b/include/asm-x86/percpu_32.h
@@ -42,34 +42,22 @@
*/
#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)
/* 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);
--
next prev parent reply other threads:[~2007-12-28 0:17 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-28 0:16 [PATCH 00/10] percpu: Per cpu code simplification V2 travis
2007-12-28 0:16 ` [PATCH 01/10] percpu: Use a kconfig variable to signal arch specific percpu setup travis
2007-12-28 0:16 ` [PATCH 02/10] percpu: Move arch XX_PER_CPU_XX definitions into linux/percpu.h travis
2007-12-28 0:16 ` [PATCH 03/10] percpu: Make the asm-generic/percpu.h more "generic" travis
2007-12-28 0:16 ` travis [this message]
2007-12-28 0:16 ` [PATCH 05/10] x86_64: Use generic percpu travis
2007-12-28 0:16 ` [PATCH 06/10] s390: " travis
2007-12-28 0:16 ` [PATCH 07/10] Powerpc: Use generic per cpu travis
2007-12-28 0:16 ` [PATCH 08/10] Sparc64: Use generic percpu travis
2007-12-28 0:18 ` David Miller
2007-12-28 0:16 ` [PATCH 09/10] ia64: " travis
2007-12-28 0:16 ` [PATCH 10/10] x86: Unify percpu.h travis
-- strict thread matches above, loose matches on Subject: below --
2008-01-08 21:10 [PATCH 00/10] percpu: Per cpu code simplification V4 travis
2008-01-08 21:10 ` [PATCH 04/10] x86_32: Use generic percpu.h travis
2008-01-08 2:11 [PATCH 00/10] percpu: Per cpu code simplification V3 travis
2008-01-08 2:11 ` [PATCH 04/10] x86_32: Use generic percpu.h travis
2007-12-28 0:10 [PATCH 00/10] percpu: Per cpu code simplification V2 travis
2007-12-28 0:10 ` [PATCH 04/10] x86_32: Use generic percpu.h travis
2007-11-28 21:09 [patch 00/10] Per cpu code simplification V2 Christoph Lameter
2007-11-28 21:09 ` [patch 04/10] x86_32: Use generic percpu.h Christoph Lameter
2007-11-30 11:11 ` Ingo Molnar
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