tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tmp.tmp2 head: adcceb5eb7aee38e4a9c15bdf599655f0e1b1324 commit: 40962503e2b9bddcef82fba70374b464ee9867b1 [12/364] sched/headers: Move thread_info APIs to <linux/sched/thread_info_api.h> config: um-x86_64_defconfig (attached as .config) 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/tip/tip.git/commit/?id=40... git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch --no-tags tip tmp.tmp2 git checkout 40962503e2b9bddcef82fba70374b464ee9867b1 # save the attached .config to linux build tree make W=1 ARCH=um SUBARCH=x86_64 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 ./arch/um/include/generated/asm/preempt.h:1, from include/linux/preempt.h:80, from include/linux/rcupdate.h:29, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:16, from arch/x86/um/shared/sysdep/kernel-offsets.h:3, from arch/um/kernel/asm-offsets.c:1: include/asm-generic/preempt.h: In function '__preempt_count_dec_and_test': 69 | return !--*preempt_count_ptr() && tif_need_resched(); | ^~~~~~~~~~~~~~~~ In file included from arch/um/kernel/asm-offsets.c:1: arch/x86/um/shared/sysdep/kernel-offsets.h: At top level: arch/x86/um/shared/sysdep/kernel-offsets.h:9:6: warning: no previous prototype for 'foo' [-Wmissing-prototypes] 9 | void foo(void) | ^~~ cc1: some warnings being treated as errors -- arch/x86/um/user-offsets.c:18:6: warning: no previous prototype for 'foo' [-Wmissing-prototypes] 18 | void foo(void) | ^~~ In file included from ./arch/um/include/generated/asm/preempt.h:1, from include/linux/preempt.h:80, from include/linux/rcupdate.h:29, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:16, from arch/x86/um/shared/sysdep/kernel-offsets.h:3, from arch/um/kernel/asm-offsets.c:1: include/asm-generic/preempt.h: In function '__preempt_count_dec_and_test': 69 | return !--*preempt_count_ptr() && tif_need_resched(); | ^~~~~~~~~~~~~~~~ In file included from arch/um/kernel/asm-offsets.c:1: arch/x86/um/shared/sysdep/kernel-offsets.h: At top level: arch/x86/um/shared/sysdep/kernel-offsets.h:9:6: warning: no previous prototype for 'foo' [-Wmissing-prototypes] 9 | void foo(void) | ^~~ cc1: some warnings being treated as errors make[2]: *** [scripts/Makefile.build:117: arch/um/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1232: prepare0] Error 2 make[1]: Target 'modules_prepare' not remade because of errors. make: *** [Makefile:215: __sub-make] Error 2 make: Target 'modules_prepare' not remade because of errors. -- arch/x86/um/user-offsets.c:18:6: warning: no previous prototype for 'foo' [-Wmissing-prototypes] 18 | void foo(void) | ^~~ In file included from ./arch/um/include/generated/asm/preempt.h:1, from include/linux/preempt.h:80, from include/linux/rcupdate.h:29, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:16, from arch/x86/um/shared/sysdep/kernel-offsets.h:3, from arch/um/kernel/asm-offsets.c:1: include/asm-generic/preempt.h: In function '__preempt_count_dec_and_test': 69 | return !--*preempt_count_ptr() && tif_need_resched(); | ^~~~~~~~~~~~~~~~ In file included from arch/um/kernel/asm-offsets.c:1: arch/x86/um/shared/sysdep/kernel-offsets.h: At top level: arch/x86/um/shared/sysdep/kernel-offsets.h:9:6: warning: no previous prototype for 'foo' [-Wmissing-prototypes] 9 | void foo(void) | ^~~ cc1: some warnings being treated as errors make[2]: *** [scripts/Makefile.build:117: arch/um/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1232: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:215: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +/tif_need_resched +69 include/asm-generic/preempt.h bdb43806589096 Peter Zijlstra 2013-09-10 61 bdb43806589096 Peter Zijlstra 2013-09-10 62 static __always_inline bool __preempt_count_dec_and_test(void) bdb43806589096 Peter Zijlstra 2013-09-10 63 { ba1f14fbe70965 Peter Zijlstra 2013-11-28 64 /* ba1f14fbe70965 Peter Zijlstra 2013-11-28 65 * Because of load-store architectures cannot do per-cpu atomic ba1f14fbe70965 Peter Zijlstra 2013-11-28 66 * operations; we cannot use PREEMPT_NEED_RESCHED because it might get ba1f14fbe70965 Peter Zijlstra 2013-11-28 67 * lost. ba1f14fbe70965 Peter Zijlstra 2013-11-28 68 */ ba1f14fbe70965 Peter Zijlstra 2013-11-28 @69 return !--*preempt_count_ptr() && tif_need_resched(); bdb43806589096 Peter Zijlstra 2013-09-10 70 } bdb43806589096 Peter Zijlstra 2013-09-10 71 :::::: The code at line 69 was first introduced by commit :::::: ba1f14fbe70965ae0fb1655a5275a62723f65b77 sched: Remove PREEMPT_NEED_RESCHED from generic code :::::: TO: Peter Zijlstra <peterz(a)infradead.org&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org