hello, the following is the error found... ----------------------------------------------------------------------------------- protection_keys.c:421:5: error: conflicting types for ‘pkey_set’ int pkey_set(int pkey, unsigned long rights, unsigned long flags) ^~~~~~~~ ------------------------------------------------------------------------------------ to reproduce this error... make -C tools/testing/selftests Details about software: Linux debian 4.17.0-rc1+ #1 SMP Thu Apr 19 18:59:45 IST 2018 x86_64 GNU/Linux GNU Make 4.2.1 Binutils 2.30 Util-linux 2.31.1 Mount 2.31.1 Linux C Library 2.27 Dynamic linker (ldd) 2.27 readlink: missing operand Try 'readlink --help' for more information. Procps 3.3.14 Kbd 2.0.4 Console-tools 2.0.4 Sh-utils 8.28 Udev 238 -- software engineer rajagiri school of engineering and technology -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html