#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
  ", __func__);
  		return NULL;
  	}
  
  	return msrs;
  }
  EXPORT_SYMBOL(msrs_alloc);
  
  void msrs_free(struct msr *msrs)
  {
  	free_percpu(msrs);
  }
  EXPORT_SYMBOL(msrs_free);