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kernel: clean up USE_GENERIC_SMP_HELPERS 

For arch which needs USE_GENERIC_SMP_HELPERS, it has to select
USE_GENERIC_SMP_HELPERS, rather than leaving a choice to user, since they
don't provide their own implementions.

Also, move on_each_cpu() to kernel/smp.c, it is strange to put it in
kernel/softirq.c.

For arch which doesn't use USE_GENERIC_SMP_HELPERS, e.g.  blackfin, only
on_each_cpu() is compiled.

Signed-off-by: Amerigo Wang <amwang@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Amerigo Wang 2011-01-12 16:59:39 -08:00 committed by Linus Torvalds
parent b8cb464e4a
commit 351f8f8e64
5 changed files with 22 additions and 29 deletions
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6
arch/mn10300/Kconfig
View File

@ -203,6 +203,7 @@ endmenu
config SMP
bool "Symmetric multi-processing support"
default y
select USE_GENERIC_SMP_HELPERS
depends on MN10300_PROC_MN2WS0038 || MN10300_PROC_MN2WS0050
---help---
This enables support for systems with more than one CPU. If you have
@ -226,11 +227,6 @@ config NR_CPUS
depends on SMP
default "2"
config USE_GENERIC_SMP_HELPERS
bool
depends on SMP
default y
source "kernel/Kconfig.preempt"
config MN10300_CURRENT_IN_E2

5
arch/x86/Kconfig
View File

@ -65,6 +65,7 @@ config X86
select HAVE_SPARSE_IRQ
select GENERIC_IRQ_PROBE
select GENERIC_PENDING_IRQ if SMP
select USE_GENERIC_SMP_HELPERS if SMP
config INSTRUCTION_DECODER
def_bool (KPROBES || PERF_EVENTS)
@ -203,10 +204,6 @@ config HAVE_INTEL_TXT
def_bool y
depends on EXPERIMENTAL && DMAR && ACPI
config USE_GENERIC_SMP_HELPERS
def_bool y
depends on SMP
config X86_32_SMP
def_bool y
depends on X86_32 && SMP

2
kernel/Makefile
View File

@ -43,7 +43,7 @@ obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
obj-$(CONFIG_USE_GENERIC_SMP_HELPERS) += smp.o
obj-$(CONFIG_SMP) += smp.o
ifneq ($(CONFIG_SMP),y)
obj-y += up.o
endif

19
kernel/smp.c
View File

@ -13,6 +13,7 @@
#include <linux/smp.h>
#include <linux/cpu.h>
#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
static struct {
struct list_head queue;
raw_spinlock_t lock;
@ -529,3 +530,21 @@ void ipi_call_unlock_irq(void)
{
raw_spin_unlock_irq(&call_function.lock);
}
#endif /* USE_GENERIC_SMP_HELPERS */
/*
* Call a function on all processors
*/
int on_each_cpu(void (*func) (void *info), void *info, int wait)
{
int ret = 0;
preempt_disable();
ret = smp_call_function(func, info, wait);
local_irq_disable();
func(info);
local_irq_enable();
preempt_enable();
return ret;
}
EXPORT_SYMBOL(on_each_cpu);

19
kernel/softirq.c
View File

@ -885,25 +885,6 @@ static __init int spawn_ksoftirqd(void)
}
early_initcall(spawn_ksoftirqd);
#ifdef CONFIG_SMP
/*
* Call a function on all processors
*/
int on_each_cpu(void (*func) (void *info), void *info, int wait)
{
int ret = 0;
preempt_disable();
ret = smp_call_function(func, info, wait);
local_irq_disable();
func(info);
local_irq_enable();
preempt_enable();
return ret;
}
EXPORT_SYMBOL(on_each_cpu);
#endif
/*
* [ These __weak aliases are kept in a separate compilation unit, so that
* GCC does not inline them incorrectly. ]