Change the page protection in Linux kernel

change_page_protection

static void disable_page_protection(void) 
{
	unsigned long cr0 = read_cr0();

	if(cr0 & (1 << 16)) 
	{
		cr0 &= ~ (1 << 16);
		write_cr0(cr0);
	}
}

static void enable_page_protection(void) 
{
	unsigned long cr0 = read_cr0();

	if(!(cr0 & (1 << 16))) 
	{
		cr0 |= (1 << 16);
		write_cr0(cr0);
	}
}