linux-kernel - Re: [PATCH v12 3/3] mm: Implement precise OOM killer task selection

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Message-ID: <202601120122.xSlEJ1AJ-lkp@intel.com>
Date: Mon, 12 Jan 2026 01:50:49 +0800
From: kernel test robot <lkp@...el.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Martin Liu <liumartin@...gle.com>,
	David Rientjes <rientjes@...gle.com>, christian.koenig@....com,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	SeongJae Park <sj@...nel.org>, Michal Hocko <mhocko@...e.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Sweet Tea Dorminy <sweettea-kernel@...miny.me>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R . Howlett" <liam.howlett@...cle.com>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christian Brauner <brauner@...nel.org>,
	Wei Yang <richard.weiyang@...il.com>,
	David Hildenbrand <david@...hat.com>,
	Miaohe Lin <linmiaohe@...wei.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-trace-kernel@...r.kernel.org, Yu Zhao <yuzhao@...gle.com>
Subject: Re: [PATCH v12 3/3] mm: Implement precise OOM killer task selection

Hi Mathieu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20260109]
[cannot apply to akpm-mm/mm-everything kees/for-next/execve tip/sched/core linus/master v6.19-rc4 v6.19-rc3 v6.19-rc2 v6.19-rc4]
[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/Mathieu-Desnoyers/lib-Introduce-hierarchical-per-cpu-counters/20260111-231206
base:   next-20260109
patch link:    https://lore.kernel.org/r/20260111150249.1222944-4-mathieu.desnoyers%40efficios.com
patch subject: [PATCH v12 3/3] mm: Implement precise OOM killer task selection
config: arc-randconfig-002-20260112 (https://download.01.org/0day-ci/archive/20260112/202601120122.xSlEJ1AJ-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260112/202601120122.xSlEJ1AJ-lkp@intel.com/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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601120122.xSlEJ1AJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:31,
                    from arch/arc/include/asm/bug.h:30,
                    from include/linux/bug.h:5,
                    from include/linux/slab.h:15,
                    from kernel/fork.c:16:
   kernel/fork.c: In function 'check_mm':
>> include/linux/kern_levels.h:5:18: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'int' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^~~~~~
   include/linux/printk.h:483:11: note: in definition of macro 'printk_index_wrap'
      _p_func(_fmt, ##__VA_ARGS__);    \
              ^~~~
   include/linux/printk.h:534:2: note: in expansion of macro 'printk'
     printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
     ^~~~~~
   include/linux/kern_levels.h:9:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_ALERT KERN_SOH "1" /* action must be taken immediately */
                       ^~~~~~~~
   include/linux/printk.h:534:9: note: in expansion of macro 'KERN_ALERT'
     printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
            ^~~~~~~~~~
   kernel/fork.c:635:4: note: in expansion of macro 'pr_alert'
       pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld Comm:%s Pid:%d\n",
       ^~~~~~~~
   kernel/fork.c:635:61: note: format string is defined here
       pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld Comm:%s Pid:%d\n",
                                                              ~~^
                                                              %d


vim +5 include/linux/kern_levels.h

314ba3520e513a Joe Perches 2012-07-30  4  
04d2c8c83d0e3a Joe Perches 2012-07-30 @5  #define KERN_SOH	"\001"		/* ASCII Start Of Header */
04d2c8c83d0e3a Joe Perches 2012-07-30  6  #define KERN_SOH_ASCII	'\001'
04d2c8c83d0e3a Joe Perches 2012-07-30  7  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki