Hi Vincent, kernel test robot noticed the following build warnings: [auto build test WARNING on 9561de3a55bed6bdd44a12820ba81ec416e705a7] url: https://github.com/intel-lab-lkp/linux/commits/Vincent-Whitchurch/watchdog-mm-Allow-dumping-memory-info-in-pretimeout/20230609-144807 base: 9561de3a55bed6bdd44a12820ba81ec416e705a7 patch link: https://lore.kernel.org/r/20230608-pretimeout-oom-v1-1-542cc91062d7%40axis.com patch subject: [PATCH] watchdog/mm: Allow dumping memory info in pretimeout config: hexagon-buildonly-randconfig-r001-20230608 (https://download.01.org/0day-ci/archive/20230609/202306091716.pcrXYphk-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce (this is a W=1 build): mkdir -p ~/bin wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 9561de3a55bed6bdd44a12820ba81ec416e705a7 b4 shazam https://lore.kernel.org/r/20230608-pretimeout-oom-v1-1-542cc91062d7@xxxxxxxx # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash 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/202306091716.pcrXYphk-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from mm/oom_kill.c:30: In file included from include/linux/swap.h:9: 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:334: 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/oom_kill.c:30: In file included from include/linux/swap.h:9: 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:334: 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/oom_kill.c:30: In file included from include/linux/swap.h:9: 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:334: 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); | ~~~~~~~~~~ ^ >> mm/oom_kill.c:156:21: warning: no previous prototype for function 'find_trylock_task_mm' [-Wmissing-prototypes] 156 | struct task_struct *find_trylock_task_mm(struct task_struct *p) | ^ mm/oom_kill.c:156:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 156 | struct task_struct *find_trylock_task_mm(struct task_struct *p) | ^ | static 7 warnings generated. vim +/find_trylock_task_mm +156 mm/oom_kill.c 151 152 /* 153 * Identical to the above, except that we avoid tasks which we can't lock, to 154 * avoid deadlocks when called from an interrupt handler. 155 */ > 156 struct task_struct *find_trylock_task_mm(struct task_struct *p) 157 { 158 struct task_struct *t; 159 160 rcu_read_lock(); 161 162 for_each_thread(p, t) { 163 if (!task_trylock(t)) 164 continue; 165 if (likely(t->mm)) 166 goto found; 167 task_unlock(t); 168 } 169 t = NULL; 170 found: 171 rcu_read_unlock(); 172 173 return t; 174 } 175 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
