The patch titled
define new percpu interface for shared data
has been added to the -mm tree. Its filename is
define-new-percpu-interface-for-shared-data-version-4.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: define new percpu interface for shared data
From: Fenghua Yu <[EMAIL PROTECTED]>
per cpu data section contains two types of data. One set which is
exclusively accessed by the local cpu and the other set which is per cpu,
but also shared by remote cpus. In the current kernel, these two sets are
not clearely separated out. This can potentially cause the same data
cacheline shared between the two sets of data, which will result in
unnecessary bouncing of the cacheline between cpus.
One way to fix the problem is to cacheline align the remotely accessed per
cpu data, both at the beginning and at the end. Because of the padding at
both ends, this will likely cause some memory wastage and also the
interface to achieve this is not clean.
This patch:
Moves the remotely accessed per cpu data (which is currently marked
as ____cacheline_aligned_in_smp) into a different section, where all the data
elements are cacheline aligned. And as such, this differentiates the local
only data and remotely accessed data cleanly.
Signed-off-by: Fenghua Yu <[EMAIL PROTECTED]>
Acked-by: Suresh Siddha <[EMAIL PROTECTED]>
Cc: Rusty Russell <[EMAIL PROTECTED]>
Cc: Christoph Lameter <[EMAIL PROTECTED]>
Cc: <[email protected]>
Cc: "Luck, Tony" <[EMAIL PROTECTED]>
Cc: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
arch/alpha/kernel/vmlinux.lds.S | 5 +----
arch/arm/kernel/vmlinux.lds.S | 1 +
arch/cris/arch-v32/vmlinux.lds.S | 5 +----
arch/frv/kernel/vmlinux.lds.S | 5 +----
arch/i386/kernel/vmlinux.lds.S | 1 +
arch/ia64/kernel/vmlinux.lds.S | 1 +
arch/m32r/kernel/vmlinux.lds.S | 5 +----
arch/mips/kernel/vmlinux.lds.S | 5 +----
arch/parisc/kernel/vmlinux.lds.S | 7 +++----
arch/powerpc/kernel/vmlinux.lds.S | 1 +
arch/ppc/kernel/vmlinux.lds.S | 5 +----
arch/s390/kernel/vmlinux.lds.S | 5 +----
arch/sh/kernel/vmlinux.lds.S | 5 +----
arch/sh64/kernel/vmlinux.lds.S | 5 ++++-
arch/sparc/kernel/vmlinux.lds.S | 5 +----
arch/sparc64/kernel/vmlinux.lds.S | 6 ++----
arch/x86_64/kernel/vmlinux.lds.S | 6 ++----
arch/xtensa/kernel/vmlinux.lds.S | 5 +----
include/asm-generic/percpu.h | 8 ++++++++
include/asm-generic/vmlinux.lds.h | 8 ++++++++
include/asm-i386/percpu.h | 5 +++++
include/asm-ia64/percpu.h | 10 ++++++++++
include/asm-powerpc/percpu.h | 7 +++++++
include/asm-s390/percpu.h | 7 +++++++
include/asm-sparc64/percpu.h | 7 +++++++
include/asm-x86_64/percpu.h | 7 +++++++
26 files changed, 84 insertions(+), 53 deletions(-)
diff -puN
arch/alpha/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/alpha/kernel/vmlinux.lds.S
---
a/arch/alpha/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/alpha/kernel/vmlinux.lds.S
@@ -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 -puN
arch/arm/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/arm/kernel/vmlinux.lds.S
---
a/arch/arm/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/arm/kernel/vmlinux.lds.S
@@ -66,6 +66,7 @@ SECTIONS
. = ALIGN(4096);
__per_cpu_start = .;
*(.data.percpu)
+ *(.data.percpu.shared_aligned)
__per_cpu_end = .;
#ifndef CONFIG_XIP_KERNEL
__init_begin = _stext;
diff -puN
arch/cris/arch-v32/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/cris/arch-v32/vmlinux.lds.S
---
a/arch/cris/arch-v32/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/cris/arch-v32/vmlinux.lds.S
@@ -91,10 +91,7 @@ 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 -puN
arch/frv/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/frv/kernel/vmlinux.lds.S
---
a/arch/frv/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/frv/kernel/vmlinux.lds.S
@@ -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 -puN
arch/i386/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/i386/kernel/vmlinux.lds.S
---
a/arch/i386/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/i386/kernel/vmlinux.lds.S
@@ -183,6 +183,7 @@ SECTIONS
.data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
__per_cpu_start = .;
*(.data.percpu)
+ *(.data.percpu.shared_aligned)
__per_cpu_end = .;
}
. = ALIGN(4096);
diff -puN
arch/ia64/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/ia64/kernel/vmlinux.lds.S
---
a/arch/ia64/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/ia64/kernel/vmlinux.lds.S
@@ -206,6 +206,7 @@ SECTIONS
{
__per_cpu_start = .;
*(.data.percpu)
+ *(.data.percpu.shared_aligned)
__per_cpu_end = .;
}
. = __phys_per_cpu_start + PERCPU_PAGE_SIZE; /* ensure percpu data fits
diff -puN
arch/m32r/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/m32r/kernel/vmlinux.lds.S
---
a/arch/m32r/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/m32r/kernel/vmlinux.lds.S
@@ -110,10 +110,7 @@ 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 -puN
arch/mips/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/mips/kernel/vmlinux.lds.S
---
a/arch/mips/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/mips/kernel/vmlinux.lds.S
@@ -119,10 +119,7 @@ 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 -puN
arch/parisc/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/parisc/kernel/vmlinux.lds.S
---
a/arch/parisc/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/parisc/kernel/vmlinux.lds.S
@@ -181,10 +181,9 @@ 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 -puN
arch/powerpc/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/powerpc/kernel/vmlinux.lds.S
---
a/arch/powerpc/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/powerpc/kernel/vmlinux.lds.S
@@ -143,6 +143,7 @@ SECTIONS
.data.percpu : {
__per_cpu_start = .;
*(.data.percpu)
+ *(.data.percpu.shared_aligned)
__per_cpu_end = .;
}
diff -puN
arch/ppc/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/ppc/kernel/vmlinux.lds.S
---
a/arch/ppc/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/ppc/kernel/vmlinux.lds.S
@@ -130,10 +130,7 @@ 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 -puN
arch/s390/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/s390/kernel/vmlinux.lds.S
---
a/arch/s390/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/s390/kernel/vmlinux.lds.S
@@ -107,10 +107,7 @@ 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 -puN
arch/sh/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/sh/kernel/vmlinux.lds.S
---
a/arch/sh/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/sh/kernel/vmlinux.lds.S
@@ -60,10 +60,7 @@ 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 -puN
arch/sh64/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/sh64/kernel/vmlinux.lds.S
---
a/arch/sh64/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/sh64/kernel/vmlinux.lds.S
@@ -87,7 +87,10 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
__per_cpu_start = .;
- .data.percpu : C_PHYS(.data.percpu) { *(.data.percpu) }
+ .data.percpu : C_PHYS(.data.percpu) {
+ *(.data.percpu)
+ *(.data.percpu.shared_aligned)
+ }
__per_cpu_end = . ;
.data.cacheline_aligned : C_PHYS(.data.cacheline_aligned) {
*(.data.cacheline_aligned) }
diff -puN
arch/sparc/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/sparc/kernel/vmlinux.lds.S
---
a/arch/sparc/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/sparc/kernel/vmlinux.lds.S
@@ -65,10 +65,7 @@ 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 -puN
arch/sparc64/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/sparc64/kernel/vmlinux.lds.S
---
a/arch/sparc64/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/sparc64/kernel/vmlinux.lds.S
@@ -90,10 +90,8 @@ SECTIONS
__initramfs_end = .;
#endif
- . = ALIGN(PAGE_SIZE);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(PAGE_SIZE)
+
. = ALIGN(PAGE_SIZE);
__init_end = .;
__bss_start = .;
diff -puN
arch/x86_64/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/x86_64/kernel/vmlinux.lds.S
---
a/arch/x86_64/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/x86_64/kernel/vmlinux.lds.S
@@ -210,10 +210,8 @@ 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 -puN
arch/xtensa/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
arch/xtensa/kernel/vmlinux.lds.S
---
a/arch/xtensa/kernel/vmlinux.lds.S~define-new-percpu-interface-for-shared-data-version-4
+++ a/arch/xtensa/kernel/vmlinux.lds.S
@@ -190,10 +190,7 @@ SECTIONS
__initramfs_end = .;
#endif
- . = ALIGN(4096);
- __per_cpu_start = .;
- .data.percpu : { *(.data.percpu) }
- __per_cpu_end = .;
+ PERCPU(4096)
/* We need this dummy segment here */
diff -puN
include/asm-generic/percpu.h~define-new-percpu-interface-for-shared-data-version-4
include/asm-generic/percpu.h
---
a/include/asm-generic/percpu.h~define-new-percpu-interface-for-shared-data-version-4
+++ a/include/asm-generic/percpu.h
@@ -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_SHARED_ALIGNED(type, name) \
+ __attribute__((__section__(".data.percpu.shared_aligned"))) \
+ __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_SHARED_ALIGNED(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 -puN
include/asm-generic/vmlinux.lds.h~define-new-percpu-interface-for-shared-data-version-4
include/asm-generic/vmlinux.lds.h
---
a/include/asm-generic/vmlinux.lds.h~define-new-percpu-interface-for-shared-data-version-4
+++ a/include/asm-generic/vmlinux.lds.h
@@ -267,3 +267,11 @@
*(.initcall7.init) \
*(.initcall7s.init)
+#define PERCPU(align) \
+ . = ALIGN(align); \
+ __per_cpu_start = .; \
+ .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \
+ *(.data.percpu) \
+ *(.data.percpu.shared_aligned) \
+ } \
+ __per_cpu_end = .;
diff -puN
include/asm-i386/percpu.h~define-new-percpu-interface-for-shared-data-version-4
include/asm-i386/percpu.h
---
a/include/asm-i386/percpu.h~define-new-percpu-interface-for-shared-data-version-4
+++ a/include/asm-i386/percpu.h
@@ -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_SHARED_ALIGNED(type, name) \
+ __attribute__((__section__(".data.percpu.shared_aligned"))) \
+ __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 -puN
include/asm-ia64/percpu.h~define-new-percpu-interface-for-shared-data-version-4
include/asm-ia64/percpu.h
---
a/include/asm-ia64/percpu.h~define-new-percpu-interface-for-shared-data-version-4
+++ a/include/asm-ia64/percpu.h
@@ -29,6 +29,16 @@
__attribute__((__section__(".data.percpu"))) \
__SMALL_ADDR_AREA __typeof__(type) per_cpu__##name
+#ifdef CONFIG_SMP
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
+ __attribute__((__section__(".data.percpu.shared_aligned"))) \
+ __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name \
+ ____cacheline_aligned_in_smp
+#else
+#define DEFINE_PER_CPU_SHARED_ALIGNED(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 -puN
include/asm-powerpc/percpu.h~define-new-percpu-interface-for-shared-data-version-4
include/asm-powerpc/percpu.h
---
a/include/asm-powerpc/percpu.h~define-new-percpu-interface-for-shared-data-version-4
+++ a/include/asm-powerpc/percpu.h
@@ -20,6 +20,11 @@
#define DEFINE_PER_CPU(type, name) \
__attribute__((__section__(".data.percpu"))) __typeof__(type)
per_cpu__##name
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
+ __attribute__((__section__(".data.percpu.shared_aligned"))) \
+ __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_SHARED_ALIGNED(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 -puN
include/asm-s390/percpu.h~define-new-percpu-interface-for-shared-data-version-4
include/asm-s390/percpu.h
---
a/include/asm-s390/percpu.h~define-new-percpu-interface-for-shared-data-version-4
+++ a/include/asm-s390/percpu.h
@@ -41,6 +41,11 @@ extern unsigned long __per_cpu_offset[NR
__attribute__((__section__(".data.percpu"))) \
__typeof__(type) per_cpu__##name
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
+ __attribute__((__section__(".data.percpu.shared_aligned"))) \
+ __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_SHARED_ALIGNED(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 -puN
include/asm-sparc64/percpu.h~define-new-percpu-interface-for-shared-data-version-4
include/asm-sparc64/percpu.h
---
a/include/asm-sparc64/percpu.h~define-new-percpu-interface-for-shared-data-version-4
+++ a/include/asm-sparc64/percpu.h
@@ -18,6 +18,11 @@ 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_SHARED_ALIGNED(type, name) \
+ __attribute__((__section__(".data.percpu.shared_aligned"))) \
+ __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 */
@@ -38,6 +43,8 @@ do {
\
#define real_setup_per_cpu_areas() do { } while (0)
#define DEFINE_PER_CPU(type, name) \
__typeof__(type) per_cpu__##name
+#define DEFINE_PER_CPU_SHARED_ALIGNED(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 -puN
include/asm-x86_64/percpu.h~define-new-percpu-interface-for-shared-data-version-4
include/asm-x86_64/percpu.h
---
a/include/asm-x86_64/percpu.h~define-new-percpu-interface-for-shared-data-version-4
+++ a/include/asm-x86_64/percpu.h
@@ -20,6 +20,11 @@
#define DEFINE_PER_CPU(type, name) \
__attribute__((__section__(".data.percpu"))) __typeof__(type)
per_cpu__##name
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
+ __attribute__((__section__(".data.percpu.shared_aligned"))) \
+ __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_SHARED_ALIGNED(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
_
Patches currently in -mm which might be from [EMAIL PROTECTED] are
define-new-percpu-interface-for-shared-data-version-4.patch
use-the-new-percpu-interface-for-shared-data-version-4.patch
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