tree: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git gfp-unmapped/v0 head: 53acd000a0eef1457aaa4930c0d2003d7785f799 commit: 253f456a5cb652a16a59cc4ac2e18669997d79cd [1/3] mm/page_alloc: introduce __GFP_UNMAPPED and MIGRETE_UNMAPPED config: x86_64-randconfig-a012-20220117 (https://download.01.org/0day-ci/archive/20220122/202201220449.6A30CSDa-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/commit/?id... git remote add rppt https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git git fetch --no-tags rppt gfp-unmapped/v0 git checkout 253f456a5cb652a16a59cc4ac2e18669997d79cd # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash 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 >>): mm/page_alloc.c:3955:15: warning: no previous prototype for 'should_fail_alloc_page' [-Wmissing-prototypes] 3955 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | ^~~~~~~~~~~~~~~~~~~~~~ In file included from <command-line>: In function 'set_pageblock_unmapped', inlined from 'get_page_from_freelist' at mm/page_alloc.c:4301:8: 346 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:327:4: note: in definition of macro '__compiletime_assert' 327 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler_types.h:346:2: note: in expansion of macro '_compiletime_assert' 346 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) | ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) | ^~~~~~~~~~~~~~~~ mm/page_alloc.c:2660:2: note: in expansion of macro 'BUILD_BUG_ON' 2660 | BUILD_BUG_ON(pageblock_order != PMD_ORDER); | ^~~~~~~~~~~~ vim +/__compiletime_assert_622 +346 include/linux/compiler_types.h eb5c2d4b45e3d2 Will Deacon 2020-07-21 332 eb5c2d4b45e3d2 Will Deacon 2020-07-21 333 #define _compiletime_assert(condition, msg, prefix, suffix) \ eb5c2d4b45e3d2 Will Deacon 2020-07-21 334 __compiletime_assert(condition, msg, prefix, suffix) eb5c2d4b45e3d2 Will Deacon 2020-07-21 335 eb5c2d4b45e3d2 Will Deacon 2020-07-21 336 /** eb5c2d4b45e3d2 Will Deacon 2020-07-21 337 * compiletime_assert - break build and emit msg if condition is false eb5c2d4b45e3d2 Will Deacon 2020-07-21 338 * @condition: a compile-time constant condition to check eb5c2d4b45e3d2 Will Deacon 2020-07-21 339 * @msg: a message to emit if condition is false eb5c2d4b45e3d2 Will Deacon 2020-07-21 340 * eb5c2d4b45e3d2 Will Deacon 2020-07-21 341 * In tradition of POSIX assert, this macro will break the build if the eb5c2d4b45e3d2 Will Deacon 2020-07-21 342 * supplied condition is *false*, emitting the supplied error message if the eb5c2d4b45e3d2 Will Deacon 2020-07-21 343 * compiler has support to do so. eb5c2d4b45e3d2 Will Deacon 2020-07-21 344 */ eb5c2d4b45e3d2 Will Deacon 2020-07-21 345 #define compiletime_assert(condition, msg) \ eb5c2d4b45e3d2 Will Deacon 2020-07-21 @346 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) eb5c2d4b45e3d2 Will Deacon 2020-07-21 347 :::::: The code at line 346 was first introduced by commit :::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h :::::: TO: Will Deacon <will(a)kernel.org&gt; :::::: CC: Will Deacon <will(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org