tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable head: df3ae4347aff9be1e9763ffa3b1015fca348bfbd commit: 676a3befc9bac1179f6a160ffe059c11e831a32c [129/143] mm/vmstat: use xchg in cpu_vm_stats_fold config: riscv-randconfig-r016-20230302 (https://download.01.org/0day-ci/archive/20230304/202303042137.LlGpydJ8-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=676a3befc9bac1179f6a160ffe059c11e831a32c git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git git fetch --no-tags akpm-mm mm-unstable git checkout 676a3befc9bac1179f6a160ffe059c11e831a32c # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202303042137.LlGpydJ8-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): ~~~~~~~~~~ ^ In file included from mm/vmstat.c:26: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:751:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] insw(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw' #define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/vmstat.c:26: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:759:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] insl(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl' #define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/vmstat.c:26: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:768:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsb(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb' #define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/vmstat.c:26: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:777:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsw(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw' #define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/vmstat.c:26: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:786:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsl(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl' #define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/vmstat.c:26: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:1134:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ >> mm/vmstat.c:907:9: error: call to '__compiletime_assert_291' declared with 'error' attribute: BUILD_BUG failed v = xchg(&pzstats->vm_stat_diff[i], 0); ^ include/linux/atomic/atomic-instrumented.h:1886:2: note: expanded from macro 'xchg' arch_xchg(__ai_ptr, __VA_ARGS__); \ ^ arch/riscv/include/asm/cmpxchg.h:146:23: note: expanded from macro 'arch_xchg' (__typeof__(*(ptr))) __xchg((ptr), _x_, sizeof(*(ptr))); \ ^ arch/riscv/include/asm/cmpxchg.h:138:3: note: expanded from macro '__xchg' BUILD_BUG(); \ ^ note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:387:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ include/linux/compiler_types.h:380:4: note: expanded from macro '__compiletime_assert' prefix ## suffix(); \ ^ <scratch space>:3:1: note: expanded from here __compiletime_assert_291 ^ mm/vmstat.c:933:9: error: call to '__compiletime_assert_292' declared with 'error' attribute: BUILD_BUG failed v = xchg(&p->vm_node_stat_diff[i], 0); ^ include/linux/atomic/atomic-instrumented.h:1886:2: note: expanded from macro 'xchg' arch_xchg(__ai_ptr, __VA_ARGS__); \ ^ arch/riscv/include/asm/cmpxchg.h:146:23: note: expanded from macro 'arch_xchg' (__typeof__(*(ptr))) __xchg((ptr), _x_, sizeof(*(ptr))); \ ^ arch/riscv/include/asm/cmpxchg.h:138:3: note: expanded from macro '__xchg' BUILD_BUG(); \ ^ note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:387:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ include/linux/compiler_types.h:380:4: note: expanded from macro '__compiletime_assert' prefix ## suffix(); \ ^ <scratch space>:7:1: note: expanded from here __compiletime_assert_292 ^ 13 warnings and 2 errors generated. vim +907 mm/vmstat.c 884 885 /* 886 * Fold the data for a cpu into the global array. 887 * There cannot be any access by the offline cpu and therefore 888 * synchronization is simplified. 889 */ 890 void cpu_vm_stats_fold(int cpu) 891 { 892 struct pglist_data *pgdat; 893 struct zone *zone; 894 int i; 895 int global_zone_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; 896 int global_node_diff[NR_VM_NODE_STAT_ITEMS] = { 0, }; 897 898 for_each_populated_zone(zone) { 899 struct per_cpu_zonestat *pzstats; 900 901 pzstats = per_cpu_ptr(zone->per_cpu_zonestats, cpu); 902 903 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) { 904 if (pzstats->vm_stat_diff[i]) { 905 int v; 906 > 907 v = xchg(&pzstats->vm_stat_diff[i], 0); 908 atomic_long_add(v, &zone->vm_stat[i]); 909 global_zone_diff[i] += v; 910 } 911 } 912 #ifdef CONFIG_NUMA 913 for (i = 0; i < NR_VM_NUMA_EVENT_ITEMS; i++) { 914 if (pzstats->vm_numa_event[i]) { 915 unsigned long v; 916 917 v = xchg(&pzstats->vm_numa_event[i], 0); 918 zone_numa_event_add(v, zone, i); 919 } 920 } 921 #endif 922 } 923 924 for_each_online_pgdat(pgdat) { 925 struct per_cpu_nodestat *p; 926 927 p = per_cpu_ptr(pgdat->per_cpu_nodestats, cpu); 928 929 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) 930 if (p->vm_node_stat_diff[i]) { 931 int v; 932 933 v = xchg(&p->vm_node_stat_diff[i], 0); 934 atomic_long_add(v, &pgdat->vm_stat[i]); 935 global_node_diff[i] += v; 936 } 937 } 938 939 fold_diff(global_zone_diff, global_node_diff); 940 } 941 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
