linux-kernel - Re: [PATCH] mm: swap: prevent possible data-race in __try_to_reclaim

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Message-Id: <20241007183052.9d87f42e19db5f9777dc8e77@linux-foundation.org>
Date: Mon, 7 Oct 2024 18:30:52 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: kernel test robot <lkp@...el.com>
Cc: Jeongjun Park <aha310510@...il.com>, llvm@...ts.linux.dev,
 oe-kbuild-all@...ts.linux.dev, kasong@...cent.com, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org,
 syzbot+fa43f1b63e3aa6f66329@...kaller.appspotmail.com
Subject: Re: [PATCH] mm: swap: prevent possible data-race in
 __try_to_reclaim_swap

On Mon, 7 Oct 2024 13:06:49 +0800 kernel test robot <lkp@...el.com> wrote:

> Hi Jeongjun,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on akpm-mm/mm-everything]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Jeongjun-Park/mm-swap-prevent-possible-data-race-in-__try_to_reclaim_swap/20241004-222733
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link:    https://lore.kernel.org/r/20241004142504.4379-1-aha310510%40gmail.com
> patch subject: [PATCH] mm: swap: prevent possible data-race in __try_to_reclaim_swap
> config: x86_64-kexec (https://download.01.org/0day-ci/archive/20241007/202410071223.t0yF8vP8-lkp@intel.com/config)
> compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241007/202410071223.t0yF8vP8-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/202410071223.t0yF8vP8-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> mm/swapfile.c:203:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
>      203 |         if (!folio_trylock(folio))
>          |             ^~~~~~~~~~~~~~~~~~~~~
>    mm/swapfile.c:254:9: note: uninitialized use occurs here
>      254 |         return ret;

This warning can't be correct?