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linux-sg2042
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percpu: use a kconfig variable to signal arch specific percpu setup 

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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
travis@sgi.com 2008-01-30 13:32:51 +01:00 committed by Ingo Molnar
parent cf8fa920cb
commit b32ef636a5
8 changed files with 14 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/ia64/Kconfig
View File

@ -80,6 +80,9 @@ config GENERIC_TIME_VSYSCALL
bool
default y
config ARCH_SETS_UP_PER_CPU_AREA
def_bool y
config DMI
bool
default y

3
arch/powerpc/Kconfig
View File

@ -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

3
arch/sparc64/Kconfig
View File

@ -66,6 +66,9 @@ 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

3
arch/x86/Kconfig
View File

@ -97,6 +97,9 @@ 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

1
include/asm-generic/percpu.h
View File

@ -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];

2
include/asm-s390/percpu.h
View File

@ -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.

2
include/asm-x86/percpu_32.h
View File

@ -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[];

4
init/main.c
View File

@ -363,7 +363,7 @@ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
#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(void)
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)