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Subject[PATCH 01/10] percpu: Use a kconfig variable to signal arch specific percpu setup
V1->V2:
- Use def_bool as suggested by Randy.

The use of the __GENERIC_PERCPU is a bit problematic since arches
may want to run their own percpu setup while using the generic
percpu definitions. Replace it through a kconfig variable.



Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>

---
arch/ia64/Kconfig | 3 +++
arch/powerpc/Kconfig | 3 +++
arch/sparc64/Kconfig | 3 +++
arch/x86/Kconfig | 3 +++
include/asm-generic/percpu.h | 1 -
include/asm-s390/percpu.h | 2 --
include/asm-x86/percpu_32.h | 2 --
init/main.c | 4 ++--
8 files changed, 14 insertions(+), 7 deletions(-)
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -82,6 +82,9 @@ config GENERIC_TIME_VSYSCALL
bool
default y

+config ARCH_SETS_UP_PER_CPU_AREA
+ def_bool y
+
config DMI
bool
default y
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -42,6 +42,9 @@ config GENERIC_HARDIRQS
bool
default y

+config ARCH_SETS_UP_PER_CPU_AREA
+ def_bool PPC64
+
config IRQ_PER_CPU
bool
default y
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -68,6 +68,9 @@ config AUDIT_ARCH
bool
default y

+config ARCH_SETS_UP_PER_CPU_AREA
+ def_bool y
+
config ARCH_NO_VIRT_TO_BUS
def_bool y

--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -106,6 +106,9 @@ config GENERIC_TIME_VSYSCALL
bool
default X86_64

+config ARCH_SETS_UP_PER_CPU_AREA
+ def_bool X86_64
+
config ARCH_SUPPORTS_OPROFILE
bool
default y
--- a/include/asm-generic/percpu.h
+++ b/include/asm-generic/percpu.h
@@ -3,7 +3,6 @@
#include <linux/compiler.h>
#include <linux/threads.h>

-#define __GENERIC_PER_CPU
#ifdef CONFIG_SMP

extern unsigned long __per_cpu_offset[NR_CPUS];
--- a/include/asm-s390/percpu.h
+++ b/include/asm-s390/percpu.h
@@ -4,8 +4,6 @@
#include <linux/compiler.h>
#include <asm/lowcore.h>

-#define __GENERIC_PER_CPU
-
/*
* s390 uses its own implementation for per cpu data, the offset of
* the cpu local data area is cached in the cpu's lowcore memory.
--- a/include/asm-x86/percpu_32.h
+++ b/include/asm-x86/percpu_32.h
@@ -41,8 +41,6 @@
* PER_CPU(cpu_gdt_descr, %ebx)
*/
#ifdef CONFIG_SMP
-/* Same as generic implementation except for optimized local access. */
-#define __GENERIC_PER_CPU

/* This is used for other cpus to find our section. */
extern unsigned long __per_cpu_offset[];
--- a/init/main.c
+++ b/init/main.c
@@ -363,7 +363,7 @@ static inline void smp_prepare_cpus(unsi

#else

-#ifdef __GENERIC_PER_CPU
+#ifndef CONFIG_ARCH_SETS_UP_PER_CPU_AREA
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;

EXPORT_SYMBOL(__per_cpu_offset);
@@ -384,7 +384,7 @@ static void __init setup_per_cpu_areas(v
ptr += size;
}
}
-#endif /* !__GENERIC_PER_CPU */
+#endif /* CONFIG_ARCH_SETS_UP_CPU_AREA */

/* Called by boot processor to activate the rest. */
static void __init smp_init(void)
--


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