tree: https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git coresched head: 6207c806c4396df23890f09e1dfde283949968a7 commit: d2fc9fc003fe3c1da298073fe8c1d73b5d795f1d [17/40] sched: Make snapshotting of min_vruntime more CGroup-friendly config: powerpc-randconfig-r024-20201112 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project a7b65741441556d295079fc4f2391d99fd1c1111) 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 # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git/commit/?i... git remote add jfern https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git git fetch --no-tags jfern coresched git checkout d2fc9fc003fe3c1da298073fe8c1d73b5d795f1d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): __do_insb ^ arch/powerpc/include/asm/io.h:541:56: note: expanded from macro '__do_insb' #define __do_insb(p, b, n) readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/fair.c:23: In file included from kernel/sched/sched.h:17: In file included from include/linux/sched/isolation.h:6: In file included from include/linux/tick.h:8: In file included from include/linux/clockchips.h:14: In file included from include/linux/clocksource.h:21: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:173:1: note: expanded from here __do_insw ^ arch/powerpc/include/asm/io.h:542:56: note: expanded from macro '__do_insw' #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/fair.c:23: In file included from kernel/sched/sched.h:17: In file included from include/linux/sched/isolation.h:6: In file included from include/linux/tick.h:8: In file included from include/linux/clockchips.h:14: In file included from include/linux/clocksource.h:21: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:175:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:543:56: note: expanded from macro '__do_insl' #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/fair.c:23: In file included from kernel/sched/sched.h:17: In file included from include/linux/sched/isolation.h:6: In file included from include/linux/tick.h:8: In file included from include/linux/clockchips.h:14: In file included from include/linux/clocksource.h:21: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:177:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:544:58: note: expanded from macro '__do_outsb' #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/fair.c:23: In file included from kernel/sched/sched.h:17: In file included from include/linux/sched/isolation.h:6: In file included from include/linux/tick.h:8: In file included from include/linux/clockchips.h:14: In file included from include/linux/clocksource.h:21: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:179:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:545:58: note: expanded from macro '__do_outsw' #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/fair.c:23: In file included from kernel/sched/sched.h:17: In file included from include/linux/sched/isolation.h:6: In file included from include/linux/tick.h:8: In file included from include/linux/clockchips.h:14: In file included from include/linux/clocksource.h:21: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:181:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ old, new); ^~~ kernel/sched/fair.c:10959:15: warning: format specifies type 'unsigned long long' but the argument has type 'long' [-Wformat] old, new); ^~~ void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi) ^ kernel/sched/fair.c:10966:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi) ^ static 15 warnings generated. vim +10959 kernel/sched/fair.c 10919 10920 #ifdef CONFIG_FAIR_GROUP_SCHED 10921 /* 10922 * Propagate the changes of the sched_entity across the tg tree to make it 10923 * visible to the root 10924 */ 10925 static void propagate_entity_cfs_rq(struct sched_entity *se) 10926 { 10927 struct cfs_rq *cfs_rq; 10928 10929 /* Start to propagate at parent */ 10930 se = se->parent; 10931 10932 for_each_sched_entity(se) { 10933 cfs_rq = cfs_rq_of(se); 10934 10935 if (cfs_rq_throttled(cfs_rq)) 10936 break; 10937 10938 update_load_avg(cfs_rq, se, UPDATE_TG); 10939 } 10940 } 10941 static void se_fi_update(struct sched_entity *se, unsigned int fi_seq, bool forceidle) 10942 { 10943 bool root = true; 10944 long old, new; 10945 10946 for_each_sched_entity(se) { 10947 struct cfs_rq *cfs_rq = cfs_rq_of(se); 10948 if (forceidle) { 10949 if (cfs_rq->forceidle_seq == fi_seq) 10950 break; 10951 cfs_rq->forceidle_seq = fi_seq; 10952 } 10953 10954 if (root) { 10955 old = cfs_rq->min_vruntime_fi; 10956 new = cfs_rq->min_vruntime; 10957 root = false; 10958 trace_printk("cfs_rq(min_vruntime_fi) %Lu->%Lu\n", 10959 old, new); 10960 } 10961 10962 cfs_rq->min_vruntime_fi = cfs_rq->min_vruntime; 10963 } 10964 } 10965 10966 void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi) 10967 { 10968 struct sched_entity *se = &p->se; 10969 10970 if (p->sched_class != &fair_sched_class) 10971 return; 10972 10973 se_fi_update(se, rq->core->core_forceidle_seq, in_fi); 10974 } 10975 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org