http://blog.csdn.net/zhangxx0811/article/details/8479969
int smp_call_function(smp_call_func_t func, void *info, int wait);
在 smp机器上,除了正在调用smp_call_function之外的所有核调用 func .
例子.
#include <linux/kernel.h>
#include <linux/module.h>
#if
CONFIG_MODVERSIONS==1
#define
MODVERSIONS
#include<linux/modversions.h>
#endif
#include
<asm/uaccess.h>
#include <linux/ctype.h>
#include
<linux/smp.h>
int print_id(int cpuid)
{
int cpu=smp_processor_id();
//
if(cpuid==smp_processor_id())
{
printk("myid
%d\n",cpu);
}
return
0;
}
MODULE_LICENSE("GPL");
int
init_module()
{
//printk("hello.word-this is the kernel speaking\n");
int cpu=0;
if(cpu==smp_processor_id())
{
printk("myid is %d\n",0);
}
else
{
smp_call_function(print_id,&cpu,1);
}
return
0;
}
void cleanup_module()
{
int
cpu=0;
printk("Short is the life of a kernel module\n");
if(cpu==smp_processor_id())
{
printk("myid is
%d\n",0);
}
else
{
smp_call_function(print_id,&cpu,1);
}
}
代码就这些
看下 makefile
obj-m := smptest_module.o
smptest_module-objs := test_printk.o
---------------------------------------------------------------------------------------------
make -C /usr/src/kernels/3.6.10-2.fc16.x86_64/ M=`pwd` modules
然后安装模块
sudo insmod smptest_module.ko
dmesg 看下输出.