宏定义

宏定义

常量宏定义

#define pi 3.14
#define x y

函数宏定义

#define MAX(x,y) ({x>y? x:y})
#define for_each_vector(x,y) for(int i = 0;i<x.size();i++)

#define for_each_cpu(cpu, mask)				
	for ((cpu) = -1;				
		(cpu) = cpumask_next((cpu), (mask)),	
		(cpu) < nr_cpu_ids;)
#define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)

for_each_possible_cpu(cpu) {
	const u32 *rate;
	int len;

	/* too early to use cpu->of_node */
	cn = of_get_cpu_node(cpu, NULL);
	if (!cn) {
		pr_err("missing device node for CPU %d
", cpu);
		continue;
	}
......