linux-kernel - Re: [PATCH v2 18/19] mm, swap: drop the SWAP_HAS

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Message-ID: <202511171912.yMOEajkV-lkp@intel.com>
Date: Mon, 17 Nov 2025 19:22:58 +0800
From: kernel test robot <lkp@...el.com>
To: Kairui Song <ryncsn@...il.com>, linux-mm@...ck.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Baoquan He <bhe@...hat.com>, Barry Song <baohua@...nel.org>,
	Chris Li <chrisl@...nel.org>, Nhat Pham <nphamcs@...il.com>,
	Yosry Ahmed <yosry.ahmed@...ux.dev>,
	David Hildenbrand <david@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Youngjun Park <youngjun.park@....com>,
	Hugh Dickins <hughd@...gle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Ying Huang <ying.huang@...ux.alibaba.com>,
	Kemeng Shi <shikemeng@...weicloud.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	linux-kernel@...r.kernel.org, Kairui Song <kasong@...cent.com>
Subject: Re: [PATCH v2 18/19] mm, swap: drop the SWAP_HAS_CACHE flag

Hi Kairui,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 41218ede767f6b218185af65ce919d0cade75f6b]

url:    https://github.com/intel-lab-lkp/linux/commits/Kairui-Song/mm-swap-rename-__read_swap_cache_async-to-swap_cache_alloc_folio/20251117-021532
base:   41218ede767f6b218185af65ce919d0cade75f6b
patch link:    https://lore.kernel.org/r/20251117-swap-table-p2-v2-18-37730e6ea6d5%40tencent.com
patch subject: [PATCH v2 18/19] mm, swap: drop the SWAP_HAS_CACHE flag
config: riscv-defconfig (https://download.01.org/0day-ci/archive/20251117/202511171912.yMOEajkV-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0bba1e76581bad04e7d7f09f5115ae5e2989e0d9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251117/202511171912.yMOEajkV-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/202511171912.yMOEajkV-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/swapfile.c:88:19: warning: unused variable 'Unused_offset' [-Wunused-const-variable]
      88 | static const char Unused_offset[] = "Unused swap offset entry ";
         |                   ^~~~~~~~~~~~~
   1 warning generated.


vim +/Unused_offset +88 mm/swapfile.c

^1da177e4c3f41 Linus Torvalds 2005-04-16  84  
^1da177e4c3f41 Linus Torvalds 2005-04-16  85  static const char Bad_file[] = "Bad swap file entry ";
^1da177e4c3f41 Linus Torvalds 2005-04-16  86  static const char Unused_file[] = "Unused swap file entry ";
^1da177e4c3f41 Linus Torvalds 2005-04-16  87  static const char Bad_offset[] = "Bad swap offset entry ";
^1da177e4c3f41 Linus Torvalds 2005-04-16 @88  static const char Unused_offset[] = "Unused swap offset entry ";
^1da177e4c3f41 Linus Torvalds 2005-04-16  89  

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