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[PATCH] make smp_prepare_cpu to a weak function

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I really wish smp_prepare_cpu() would disappear eventually.  In the interim
this is ideally a weak function, so we dont end up changing several places
to define this dummy in headers.

Today since the dummy declaration is done only in drivers/base/cpu.c but
the function is called in kernel/power/smp.c i get undefined reference in
my cpu hotplug code for x86_64 under development.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ashok Raj 2005-06-25 14:54:57 -07:00 committed by Linus Torvalds
parent e1367daf3e
commit 52a119feaa
3 changed files with 6 additions and 7 deletions
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9
drivers/base/cpu.c
View file

@ -16,9 +16,10 @@ struct sysdev_class cpu_sysdev_class = {
EXPORT_SYMBOL(cpu_sysdev_class);
#ifdef CONFIG_HOTPLUG_CPU
#ifndef __HAVE_ARCH_SMP_PREPARE_CPU
#define smp_prepare_cpu(cpu) (0)
#endif
int __attribute__((weak)) smp_prepare_cpu (int cpu)
{
return 0;
}
static ssize_t show_online(struct sys_device *dev, char *buf)
{
@ -41,7 +42,7 @@ static ssize_t store_online(struct sys_device *dev, const char *buf,
break;
case '1':
ret = smp_prepare_cpu(cpu->sysdev.id);
if (ret == 0)
if (!ret)
ret = cpu_up(cpu->sysdev.id);
break;
default:

3
include/asm-i386/smp.h
View file

@ -51,9 +51,6 @@ extern u8 x86_cpu_to_apicid[];
#ifdef CONFIG_HOTPLUG_CPU
extern void cpu_exit_clear(void);
extern void cpu_uninit(void);
#define __HAVE_ARCH_SMP_PREPARE_CPU
extern int smp_prepare_cpu(int cpu);
#endif
/*

1
include/linux/cpu.h
View file

@ -69,6 +69,7 @@ extern struct semaphore cpucontrol;
register_cpu_notifier(&fn##_nb); \
}
int cpu_down(unsigned int cpu);
extern int __attribute__((weak)) smp_prepare_cpu(int cpu);
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
#else
#define lock_cpu_hotplug() do { } while (0)