Hi Alex, kernel test robot noticed the following build warnings: [auto build test WARNING on v6.9] [also build test WARNING on linus/master next-20240531] [cannot apply to sj/damon/next akpm-mm/mm-everything v6.10-rc1] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Alex-Rusuf/mm-damon-core-add-struct-kdamond-abstraction-layer/20240531-202756 base: v6.9 patch link: https://lore.kernel.org/r/20240531122320.909060-3-yorha.op%40gmail.com patch subject: [PATCH v2 2/2] mm/damon/core: implement multi-context support config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20240601/202406010337.eZEQ5XmV-lkp@xxxxxxxxx/config) compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project bafda89a0944d947fc4b3b5663185e07a397ac30) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240601/202406010337.eZEQ5XmV-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202406010337.eZEQ5XmV-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from mm/damon/dbgfs.c:10: In file included from include/linux/damon.h:11: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:328: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 547 | val = __raw_readb(PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) | ^ In file included from mm/damon/dbgfs.c:10: In file included from include/linux/damon.h:11: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:328: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) | ^ In file included from mm/damon/dbgfs.c:10: In file included from include/linux/damon.h:11: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:328: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 584 | __raw_writeb(value, PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ In file included from mm/damon/dbgfs.c:10: In file included from include/linux/damon.h:11: In file included from include/linux/memcontrol.h:21: In file included from include/linux/mm.h:2210: include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 522 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_" | ~~~~~~~~~~~ ^ ~~~ >> mm/damon/dbgfs.c:400:13: warning: unknown pragma ignored [-Wunknown-pragmas] 400 | #pragma GCC push_options | ^ mm/damon/dbgfs.c:401:13: warning: unknown pragma ignored [-Wunknown-pragmas] 401 | #pragma GCC optimize("O0") | ^ mm/damon/dbgfs.c:446:13: warning: unknown pragma ignored [-Wunknown-pragmas] 446 | #pragma GCC pop_options | ^ >> mm/damon/dbgfs.c:1125:13: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] 1125 | } else if (!strncmp(kbuf, "off", count)) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/damon/dbgfs.c:1132:7: note: uninitialized use occurs here 1132 | if (!ret) | ^~~ mm/damon/dbgfs.c:1125:9: note: remove the 'if' if its condition is always false 1125 | } else if (!strncmp(kbuf, "off", count)) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1126 | dbgfs_stop_kdamonds(); | ~~~~~~~~~~~~~~~~~~~~~~ 1127 | } else { | ~~~~~~ mm/damon/dbgfs.c:1101:13: note: initialize the variable 'ret' to silence this warning 1101 | ssize_t ret; | ^ | = 0 mm/damon/dbgfs.c:893:13: warning: unused function 'dbgfs_destroy_damon_ctx' [-Wunused-function] 893 | static void dbgfs_destroy_damon_ctx(struct damon_ctx *ctx) | ^~~~~~~~~~~~~~~~~~~~~~~ 12 warnings generated. vim +400 mm/damon/dbgfs.c 399 > 400 #pragma GCC push_options 401 #pragma GCC optimize("O0") 402 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
