Re: [PATCH] watchdog/mm: Allow dumping memory info in pretimeout
From: kernel test robot
Date: Fri Jun 09 2023 - 05:19:13 EST
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
--
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https://github.com/intel/lkp-tests/wiki