tree: https://android.googlesource.com/kernel/goldfish android-3.18 head: e4742bb317218e1c75c86aa765e50cdd06d2c007 commit: a4375387b1009a40dca013d11261c2fbafa5ce00 [106/187] fs: add a VALID_OPEN_FLAGS config: alpha-defconfig (attached as .config) compiler: alpha-linux-gcc (GCC) 5.5.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git remote add android-goldfish https://android.googlesource.com/kernel/goldfish git fetch --no-tags android-goldfish android-3.18 git checkout a4375387b1009a40dca013d11261c2fbafa5ce00 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-5.5.0 make.cross ARCH=alpha If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/mempolicy.h:14:0, from include/linux/shmem_fs.h:6, from fs/fcntl.c:24: include/linux/pagemap.h: In function 'fault_in_multipages_readable': include/linux/pagemap.h:633:16: warning: variable 'c' set but not used [-Wunused-but-set-variable] volatile char c; ^ In file included from include/uapi/linux/stddef.h:1:0, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/syscalls.h:70, from fs/fcntl.c:7: fs/fcntl.c: In function 'fcntl_init': _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ include/linux/compiler.h:445:4: note: in definition of macro '__compiletime_assert' prefix ## suffix(); \ ^ include/linux/compiler.h:462:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ include/linux/bug.h:50:37: note: in expansion of macro 'compiletime_assert' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^ include/linux/bug.h:74:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^ fs/fcntl.c:747:2: note: in expansion of macro 'BUILD_BUG_ON' BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != ^ vim +/__compiletime_assert_24 +462 include/linux/compiler.h c361d3e54364d1 Daniel Santos 2013-02-21 439 9a8ab1c39970a4 Daniel Santos 2013-02-21 440 #define __compiletime_assert(condition, msg, prefix, suffix) \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 441 do { \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 442 bool __cond = !(condition); \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 443 extern void prefix ## suffix(void) __compiletime_error(msg); \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 444 if (__cond) \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 445 prefix ## suffix(); \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 446 __compiletime_error_fallback(__cond); \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 447 } while (0) 9a8ab1c39970a4 Daniel Santos 2013-02-21 448 9a8ab1c39970a4 Daniel Santos 2013-02-21 449 #define _compiletime_assert(condition, msg, prefix, suffix) \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 450 __compiletime_assert(condition, msg, prefix, suffix) 9a8ab1c39970a4 Daniel Santos 2013-02-21 451 9a8ab1c39970a4 Daniel Santos 2013-02-21 452 /** 9a8ab1c39970a4 Daniel Santos 2013-02-21 453 * compiletime_assert - break build and emit msg if condition is false 9a8ab1c39970a4 Daniel Santos 2013-02-21 454 * @condition: a compile-time constant condition to check 9a8ab1c39970a4 Daniel Santos 2013-02-21 455 * @msg: a message to emit if condition is false 9a8ab1c39970a4 Daniel Santos 2013-02-21 456 * 9a8ab1c39970a4 Daniel Santos 2013-02-21 457 * In tradition of POSIX assert, this macro will break the build if the 9a8ab1c39970a4 Daniel Santos 2013-02-21 458 * supplied condition is *false*, emitting the supplied error message if the 9a8ab1c39970a4 Daniel Santos 2013-02-21 459 * compiler has support to do so. 9a8ab1c39970a4 Daniel Santos 2013-02-21 460 */ 9a8ab1c39970a4 Daniel Santos 2013-02-21 461 #define compiletime_assert(condition, msg) \ 6c0c303e5d07e1 Vegard Nossum 2020-04-06 @462 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) 9a8ab1c39970a4 Daniel Santos 2013-02-21 463 :::::: The code at line 462 was first introduced by commit :::::: 6c0c303e5d07e1af6ff4fca1be7e32f97186c42a compiler.h: fix error in BUILD_BUG_ON() reporting :::::: TO: Vegard Nossum <vegard.nossum(a)oracle.com&gt; :::::: CC: Lee Jones <lee.jones(a)linaro.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org