>> "../../../../usr/include/" directory doesn't have header files if >> different output directory is used for kselftests build like "make -C >> tools/tests/selftest O=build". Can you try adding recently added >> variable, KHDR_INCLUDES here which makes this kind of headers inclusion >> easy and correct for other build combinations as well? >> >> > > Hi Muhammad, > > I just pulled linux-next, and tried with KHDR_INCLUDES. It works. Very nice > work! I really appreciate you made headers inclusion compatible. However, > my case is a little more complicated. It will throw warnings with -I, using > -isystem can suppress these warnings, more details please refer to > https://lore.kernel.org/all/C340461A-6FD2-440A-8EFC-D7E85BF48DB5@xxxxxxxxxx/ > > According to this case, do you think will it be better to export header path > (KHDR_INCLUDES) without “-I”? Well said. I've thought about it and it seems like -isystem is better than -I. I've sent a patch: https://lore.kernel.org/linux-kselftest/20220214160756.3543590-1-usama.anjum@xxxxxxxxxxxxx/ I'm looking forward to discussion on it. Thanks, Usama