1. 根目录:
2. arch
3. x86
4. lib
5. msr.c

#include <linux/module.h>
#include <linux/preempt.h>
#include <asm/msr.h>

struct msr *msrs_alloc(void)
{
	struct msr *msrs = NULL;

	msrs = alloc_percpu(struct msr);
	if (!msrs) {
		pr_warning("%s: error allocating msrs\n", __func__);
		return NULL;
	}

	return msrs;
}
EXPORT_SYMBOL(msrs_alloc);

void msrs_free(struct msr *msrs)
{
	free_percpu(msrs);
}
EXPORT_SYMBOL(msrs_free);