Hi, There are three macro(DEFINE, BLANK, OFFSET) contained in /linux/kbuild.h in kernerl version 2.6.32.60. All of them are inline assembly statements. I don't know what they means. Could anyone please explain them to me. Also I have written a test module to watch what they will print or do something, however I failed. I couldn't compile it . Here is my code, I just steal it from arch/x86/kernel/asm-offsets_32.c: #define PZ 4096 static int __init test_init(void) { DEFINE(PZ_asm, PZ); BLANK(); OFFSET(INODE, inode, i_hash); return 0; } And here is message when I compiled it: /home/kiongf/kernel_module_test/test/test.c: Assembler messages: /home/kiongf/kernel_module_test/test/test.c:13: Error: junk at end of line, first unrecognized character is `-' /home/kiongf/kernel_module_test/test/test.c:14: Error: junk at end of line, first unrecognized character is `-' /home/kiongf/kernel_module_test/test/test.c:15: Error: junk at end of line, first unrecognized character is `-' Did I do something wrong? Thanks.