el/asm-offsets.c:9: arch/ia64/include/asm/bitops.h: In function 'set_bit': arch/ia64/include/asm/bitops.h:47: error: implicit declaration of function 'BUILD_BUG_ON' Obvious inclusion of kernel.h doesn't fix it, because of circular dependencies involving fls.h and log2(). Fixing the latter requires some serious header surgery, it seems, so just remove BUILD_BUG_ON for now. Signed-off-by: Alexey Dobriyan Signed-off-by: Tony Luck :