[PATCH 1/2] Define percpu smp cacheline align interface

From: Fenghua Yu
Date: Fri May 04 2007 - 20:15:05 EST


Define percpu smp cacheline align interface

Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Acked-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>

diff -Nurp linux-2.6.21-rc7.0/arch/alpha/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/alpha/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/alpha/kernel/vmlinux.lds.S 2007-05-01 07:32:58.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/alpha/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -69,10 +69,7 @@ SECTIONS
. = ALIGN(8);
SECURITY_INIT

- . = ALIGN(8192);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(8192)

. = ALIGN(2*8192);
__init_end = .;
diff -Nurp linux-2.6.21-rc7.0/arch/arm/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/arm/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/arm/kernel/vmlinux.lds.S 2007-05-01 07:32:58.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/arm/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -59,10 +59,7 @@ SECTIONS
usr/built-in.o(.init.ramfs)
__initramfs_end = .;
#endif
- . = ALIGN(4096);
- __per_cpu_start = .;
- *(.data.percpu)
- __per_cpu_end = .;
+ PERCPU(4096)
#ifndef CONFIG_XIP_KERNEL
__init_begin = _stext;
*(.init.data)
diff -Nurp linux-2.6.21-rc7.0/arch/cris/arch-v32/vmlinux.lds.S linux-2.6.21-rc7.1/arch/cris/arch-v32/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/cris/arch-v32/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/cris/arch-v32/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -92,10 +92,7 @@ SECTIONS
}
SECURITY_INIT

- . = ALIGN (8192);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(8192)

#ifdef CONFIG_BLK_DEV_INITRD
.init.ramfs : {
diff -Nurp linux-2.6.21-rc7.0/arch/frv/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/frv/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/frv/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/frv/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -57,10 +57,7 @@ SECTIONS
__alt_instructions_end = .;
.altinstr_replacement : { *(.altinstr_replacement) }

- . = ALIGN(4096);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(4096)

#ifdef CONFIG_BLK_DEV_INITRD
. = ALIGN(4096);
diff -Nurp linux-2.6.21-rc7.0/arch/i386/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/i386/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/i386/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/i386/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -185,12 +185,7 @@ SECTIONS
__initramfs_end = .;
}
#endif
- . = ALIGN(4096);
- .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
- __per_cpu_start = .;
- *(.data.percpu)
- __per_cpu_end = .;
- }
+ PERCPU(4096)
. = ALIGN(4096);
/* freed after init ends here */

diff -Nurp linux-2.6.21-rc7.0/arch/ia64/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/ia64/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/ia64/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/ia64/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -206,6 +206,7 @@ SECTIONS
{
__per_cpu_start = .;
*(.data.percpu)
+ *(.data.percpu.cacheline_aligned_in_smp)
__per_cpu_end = .;
}
. = __phys_per_cpu_start + PERCPU_PAGE_SIZE; /* ensure percpu data fits
diff -Nurp linux-2.6.21-rc7.0/arch/m32r/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/m32r/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/m32r/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/m32r/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -111,10 +111,7 @@ SECTIONS
__initramfs_end = .;
#endif

- . = ALIGN(4096);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(4096)
. = ALIGN(4096);
__init_end = .;
/* freed after init ends here */
diff -Nurp linux-2.6.21-rc7.0/arch/mips/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/mips/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/mips/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/mips/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -121,10 +121,7 @@ SECTIONS
.init.ramfs : { *(.init.ramfs) }
__initramfs_end = .;
#endif
- . = ALIGN(_PAGE_SIZE);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(_PAGE_SIZE)
. = ALIGN(_PAGE_SIZE);
__init_end = .;
/* freed after init ends here */
diff -Nurp linux-2.6.21-rc7.0/arch/parisc/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/parisc/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/parisc/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/parisc/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -182,10 +182,9 @@ SECTIONS
.init.ramfs : { *(.init.ramfs) }
__initramfs_end = .;
#endif
- . = ALIGN(ASM_PAGE_SIZE);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+
+ PERCPU(ASM_PAGE_SIZE)
+
. = ALIGN(ASM_PAGE_SIZE);
__init_end = .;
/* freed after init ends here */
diff -Nurp linux-2.6.21-rc7.0/arch/powerpc/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/powerpc/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/powerpc/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/powerpc/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -139,12 +139,7 @@ SECTIONS
__initramfs_end = .;
}
#endif
- . = ALIGN(PAGE_SIZE);
- .data.percpu : {
- __per_cpu_start = .;
- *(.data.percpu)
- __per_cpu_end = .;
- }
+ PERCPU(PAGE_SIZE)

. = ALIGN(8);
.machine.desc : {
diff -Nurp linux-2.6.21-rc7.0/arch/ppc/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/ppc/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/ppc/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/ppc/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -131,10 +131,7 @@ SECTIONS
__ftr_fixup : { *(__ftr_fixup) }
__stop___ftr_fixup = .;

- . = ALIGN(4096);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(4096)

#ifdef CONFIG_BLK_DEV_INITRD
. = ALIGN(4096);
diff -Nurp linux-2.6.21-rc7.0/arch/s390/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/s390/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/s390/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/s390/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -108,10 +108,7 @@ SECTIONS
. = ALIGN(2);
__initramfs_end = .;
#endif
- . = ALIGN(4096);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(4096)
. = ALIGN(4096);
__init_end = .;
/* freed after init ends here */
diff -Nurp linux-2.6.21-rc7.0/arch/sh/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/sh/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/sh/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/sh/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -61,10 +61,7 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
__nosave_end = .;

- . = ALIGN(PAGE_SIZE);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(PAGE_SIZE)
.data.cacheline_aligned : { *(.data.cacheline_aligned) }

_edata = .; /* End of data section */
diff -Nurp linux-2.6.21-rc7.0/arch/sh64/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/sh64/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/sh64/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/sh64/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -86,10 +86,7 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
.data.page_aligned : C_PHYS(.data.page_aligned) { *(.data.page_aligned) }

- . = ALIGN(PAGE_SIZE);
- __per_cpu_start = .;
- .data.percpu : C_PHYS(.data.percpu) { *(.data.percpu) }
- __per_cpu_end = . ;
+ PERCPU(PAGE_SIZE)
.data.cacheline_aligned : C_PHYS(.data.cacheline_aligned) { *(.data.cacheline_aligned) }

_edata = .; /* End of data section */
diff -Nurp linux-2.6.21-rc7.0/arch/sparc/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/sparc/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/sparc/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/sparc/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -66,10 +66,7 @@ SECTIONS
__initramfs_end = .;
#endif

- . = ALIGN(4096);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(4096)
. = ALIGN(4096);
__init_end = .;
. = ALIGN(32);
diff -Nurp linux-2.6.21-rc7.0/arch/sparc64/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/sparc64/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/sparc64/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/sparc64/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -90,10 +90,7 @@ SECTIONS
__initramfs_end = .;
#endif

- . = ALIGN(8192);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(8192)
. = ALIGN(8192);
__init_end = .;
__bss_start = .;
diff -Nurp linux-2.6.21-rc7.0/arch/x86_64/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/x86_64/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/x86_64/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/x86_64/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -209,10 +209,8 @@ SECTIONS
__initramfs_end = .;
#endif

- . = ALIGN(4096);
- __per_cpu_start = .;
- .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(4096)
+
. = ALIGN(4096);

__init_end = .;
diff -Nurp linux-2.6.21-rc7.0/arch/xtensa/kernel/vmlinux.lds.S linux-2.6.21-rc7.1/arch/xtensa/kernel/vmlinux.lds.S
--- linux-2.6.21-rc7.0/arch/xtensa/kernel/vmlinux.lds.S 2007-05-01 07:32:59.000000000 -0700
+++ linux-2.6.21-rc7.1/arch/xtensa/kernel/vmlinux.lds.S 2007-05-02 17:00:29.000000000 -0700
@@ -198,10 +198,7 @@ SECTIONS
__ftr_fixup : { *(__ftr_fixup) }
__stop___ftr_fixup = .;

- . = ALIGN(4096);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(4096)

#ifdef CONFIG_BLK_DEV_INITRD
. = ALIGN(4096);
diff -Nurp linux-2.6.21-rc7.0/include/asm-generic/percpu.h linux-2.6.21-rc7.1/include/asm-generic/percpu.h
--- linux-2.6.21-rc7.0/include/asm-generic/percpu.h 2007-05-01 07:33:03.000000000 -0700
+++ linux-2.6.21-rc7.1/include/asm-generic/percpu.h 2007-05-04 11:15:26.000000000 -0700
@@ -14,6 +14,11 @@ extern unsigned long __per_cpu_offset[NR
#define DEFINE_PER_CPU(type, name) \
__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name

+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ __attribute__((__section__(".data.percpu.cacheline_aligned_in_smp"))) \
+ __typeof__(type) per_cpu__##name \
+ ____cacheline_aligned_in_smp
+
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*({ \
extern int simple_identifier_##var(void); \
@@ -34,6 +39,9 @@ do { \
#define DEFINE_PER_CPU(type, name) \
__typeof__(type) per_cpu__##name

+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ DEFINE_PER_CPU(type, name)
+
#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
diff -Nurp linux-2.6.21-rc7.0/include/asm-generic/vmlinux.lds.h linux-2.6.21-rc7.1/include/asm-generic/vmlinux.lds.h
--- linux-2.6.21-rc7.0/include/asm-generic/vmlinux.lds.h 2007-05-01 07:33:03.000000000 -0700
+++ linux-2.6.21-rc7.1/include/asm-generic/vmlinux.lds.h 2007-05-02 17:00:29.000000000 -0700
@@ -265,3 +265,13 @@
*(.initcall6s.init) \
*(.initcall7.init) \
*(.initcall7s.init)
+
+#define PERCPU(align) \
+ . = ALIGN(align); \
+ __per_cpu_start = .; \
+ .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \
+ *(.data.percpu) \
+ *(.data.percpu.cacheline_aligned_in_smp) \
+ } \
+ __per_cpu_end = .;
+
diff -Nurp linux-2.6.21-rc7.0/include/asm-i386/percpu.h linux-2.6.21-rc7.1/include/asm-i386/percpu.h
--- linux-2.6.21-rc7.0/include/asm-i386/percpu.h 2007-05-01 07:33:03.000000000 -0700
+++ linux-2.6.21-rc7.1/include/asm-i386/percpu.h 2007-05-02 17:00:29.000000000 -0700
@@ -54,6 +54,11 @@ extern unsigned long __per_cpu_offset[];
#define DEFINE_PER_CPU(type, name) \
__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name

+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ __attribute__((__section__(".data.percpu.cacheline_aligned_in_smp"))) \
+ __typeof__(type) per_cpu__##name \
+ ____cacheline_aligned_in_smp
+
/* We can use this directly for local CPU (faster). */
DECLARE_PER_CPU(unsigned long, this_cpu_off);

diff -Nurp linux-2.6.21-rc7.0/include/asm-ia64/percpu.h linux-2.6.21-rc7.1/include/asm-ia64/percpu.h
--- linux-2.6.21-rc7.0/include/asm-ia64/percpu.h 2007-04-15 16:50:57.000000000 -0700
+++ linux-2.6.21-rc7.1/include/asm-ia64/percpu.h 2007-05-04 11:47:45.000000000 -0700
@@ -29,6 +29,16 @@
__attribute__((__section__(".data.percpu"))) \
__SMALL_ADDR_AREA __typeof__(type) per_cpu__##name

+#ifdef CONFIG_SMP
+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ __attribute__((__section__(".data.percpu.cacheline_aligned_in_smp"))) \
+ __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name \
+ ____cacheline_aligned_in_smp
+#else
+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ DEFINE_PER_CPU(type, name)
+#endif
+
/*
* Pretty much a literal copy of asm-generic/percpu.h, except that percpu_modcopy() is an
* external routine, to avoid include-hell.
diff -Nurp linux-2.6.21-rc7.0/include/asm-powerpc/percpu.h linux-2.6.21-rc7.1/include/asm-powerpc/percpu.h
--- linux-2.6.21-rc7.0/include/asm-powerpc/percpu.h 2007-04-15 16:50:57.000000000 -0700
+++ linux-2.6.21-rc7.1/include/asm-powerpc/percpu.h 2007-05-04 11:19:37.000000000 -0700
@@ -20,6 +20,11 @@
#define DEFINE_PER_CPU(type, name) \
__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name

+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ __attribute__((__section__(".data.percpu.cacheline_aligned_in_smp"))) \
+ __typeof__(type) per_cpu__##name \
+ ____cacheline_aligned_in_smp
+
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
@@ -40,6 +45,8 @@ extern void setup_per_cpu_areas(void);

#define DEFINE_PER_CPU(type, name) \
__typeof__(type) per_cpu__##name
+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ DEFINE_PER_CPU(type, name)

#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
diff -Nurp linux-2.6.21-rc7.0/include/asm-s390/percpu.h linux-2.6.21-rc7.1/include/asm-s390/percpu.h
--- linux-2.6.21-rc7.0/include/asm-s390/percpu.h 2007-04-15 16:50:57.000000000 -0700
+++ linux-2.6.21-rc7.1/include/asm-s390/percpu.h 2007-05-04 11:20:19.000000000 -0700
@@ -41,6 +41,11 @@ extern unsigned long __per_cpu_offset[NR
__attribute__((__section__(".data.percpu"))) \
__typeof__(type) per_cpu__##name

+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ __attribute__((__section__(".data.percpu.cacheline_aligned_in_smp"))) \
+ __typeof__(type) per_cpu__##name \
+ ____cacheline_aligned_in_smp
+
#define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
#define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
@@ -59,6 +64,8 @@ do { \

#define DEFINE_PER_CPU(type, name) \
__typeof__(type) per_cpu__##name
+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ DEFINE_PER_CPU(type, name)

#define __get_cpu_var(var) __reloc_hide(var,0)
#define __raw_get_cpu_var(var) __reloc_hide(var,0)
diff -Nurp linux-2.6.21-rc7.0/include/asm-sparc64/percpu.h linux-2.6.21-rc7.1/include/asm-sparc64/percpu.h
--- linux-2.6.21-rc7.0/include/asm-sparc64/percpu.h 2007-05-01 07:33:06.000000000 -0700
+++ linux-2.6.21-rc7.1/include/asm-sparc64/percpu.h 2007-05-04 11:20:51.000000000 -0700
@@ -17,6 +17,11 @@ extern unsigned long __per_cpu_shift;
#define DEFINE_PER_CPU(type, name) \
__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name

+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ __attribute__((__section__(".data.percpu.cacheline_aligned_in_smp"))) \
+ __typeof__(type) per_cpu__##name \
+ ____cacheline_aligned_in_smp
+
register unsigned long __local_per_cpu_offset asm("g5");

/* var is in discarded region: offset to particular copy we want */
@@ -36,6 +41,8 @@ do { \

#define DEFINE_PER_CPU(type, name) \
__typeof__(type) per_cpu__##name
+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ DEFINE_PER_CPU(type, name)

#define per_cpu(var, cpu) (*((void)cpu, &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
diff -Nurp linux-2.6.21-rc7.0/include/asm-x86_64/percpu.h linux-2.6.21-rc7.1/include/asm-x86_64/percpu.h
--- linux-2.6.21-rc7.0/include/asm-x86_64/percpu.h 2007-05-01 07:33:06.000000000 -0700
+++ linux-2.6.21-rc7.1/include/asm-x86_64/percpu.h 2007-05-04 11:21:25.000000000 -0700
@@ -20,6 +20,11 @@
#define DEFINE_PER_CPU(type, name) \
__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name

+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ __attribute__((__section__(".data.percpu.cacheline_aligned_in_smp"))) \
+ __typeof__(type) per_cpu__##name \
+ ____cacheline_internodealigned_in_smp
+
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*({ \
extern int simple_identifier_##var(void); \
@@ -46,6 +51,8 @@ extern void setup_per_cpu_areas(void);

#define DEFINE_PER_CPU(type, name) \
__typeof__(type) per_cpu__##name
+#define DEFINE_PER_CPU_CACHELINE_ALIGNED_IN_SMP(type, name) \
+ DEFINE_PER_CPU(type, name)

#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
-
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