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

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Message-ID: <0b1ec996-47c7-4ca9-84ca-78fe977c4dfb@efficios.com>
Date: Sun, 11 Jan 2026 14:30:30 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: kernel test robot <lkp@...el.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, "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

On 2026-01-11 12:50, kernel test robot wrote:
> Hi Mathieu,
> 
> kernel test robot noticed the following build warnings:
> 
[...]> 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

percpu_counter_tree_precise_sum() needs to return a long, not int.
Will fix for v13.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com