{ virtual_addr1 = kmalloc(0x20, GFP_USER); phy_addr1 = __pa(virtual_addr1 ); virtual_addr2 = ioremap(phy_addr1, 0x20 ); } I noticed that virtual_addr1 is not equal to virtual_addr2. And if i dereference virtual_addr2 ( *virtual_addr2 ), kernel crash. What is wrong here ? -Ratheesh -- To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs