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Date: Mon, 29 Nov 2010 14:06:07 +0800
From: Amerigo Wang <amwang@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Amerigo Wang <amwang@...hat.com>,
David Howells <dhowells@...hat.com>,
Koichi Yasutake <yasutake.koichi@...panasonic.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
Yinghai Lu <yinghai@...nel.org>, Tejun Heo <tj@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Jens Axboe <jaxboe@...ionio.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Venkatesh Pallipadi <venki@...gle.com>,
linux-am33-list@...hat.com
Subject: [PATCH] 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@...hat.com>
---
arch/mn10300/Kconfig | 6 +-----
arch/x86/Kconfig | 5 +----
kernel/Makefile | 2 +-
kernel/smp.c | 20 ++++++++++++++++++++
kernel/softirq.c | 19 -------------------
5 files changed, 23 insertions(+), 29 deletions(-)
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 41ba385..8ed41cf 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -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
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e330da2..736beea 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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
diff --git a/kernel/Makefile b/kernel/Makefile
index 0b5ff08..55f2f93 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -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
diff --git a/kernel/smp.c b/kernel/smp.c
index 12ed8b0..708f248 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -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 +530,22 @@ 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);
+
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 18f4be0..0ca9f48 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -883,25 +883,6 @@ 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. ]
--
1.7.1
--
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