linux-kernel - [ammarfaizi2-block:akpm/mm/mm-unstable 146/162] include/linux/memremap.h:258:9: error: expression which evaluates to zero treated as a null pointer constant of type 'struct folio *'

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Message-ID: <202210221343.e50d98Ht-lkp@intel.com>
Date:   Sat, 22 Oct 2022 13:27:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: [ammarfaizi2-block:akpm/mm/mm-unstable 146/162]
 include/linux/memremap.h:258:9: error: expression which evaluates to zero
 treated as a null pointer constant of type 'struct folio *'

tree:   https://github.com/ammarfaizi2/linux-block akpm/mm/mm-unstable
head:   fc93ddbd10610f8f621fba75c1a0f110f543a7bd
commit: e634e7e18f3bf0b30b8f9f16434929d950b7ac33 [146/162] mm/memremap: Introduce pgmap_request_folio() using pgmap offsets
config: s390-randconfig-r044-20221019
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/e634e7e18f3bf0b30b8f9f16434929d950b7ac33
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block akpm/mm/mm-unstable
        git checkout e634e7e18f3bf0b30b8f9f16434929d950b7ac33
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash lib/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from lib/test_bitops.c:9:
   In file included from include/linux/module.h:19:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:173:
   In file included from arch/s390/include/asm/mmu_context.h:11:
   In file included from arch/s390/include/asm/pgalloc.h:18:
   In file included from include/linux/mm.h:31:
>> include/linux/memremap.h:258:9: error: expression which evaluates to zero treated as a null pointer constant of type 'struct folio *' [-Werror,-Wnon-literal-null-conversion]
           return false;
                  ^~~~~
   1 error generated.


vim +258 include/linux/memremap.h

8e37d00a850160 Christoph Hellwig 2017-12-29  254  
e634e7e18f3bf0 Dan Williams      2022-10-20  255  static inline struct folio *pgmap_request_folio(struct dev_pagemap *pgmap,
e634e7e18f3bf0 Dan Williams      2022-10-20  256  						pgoff_t pgmap_offset, int order)
e8ca415e7cc5d6 Dan Williams      2022-10-14  257  {
e8ca415e7cc5d6 Dan Williams      2022-10-14 @258  	return false;
e8ca415e7cc5d6 Dan Williams      2022-10-14  259  }
e8ca415e7cc5d6 Dan Williams      2022-10-14  260  

:::::: The code at line 258 was first introduced by commit
:::::: e8ca415e7cc5d6c4d431b3dda58877ff24b021ee fsdax: introduce pgmap_request_folios()

:::::: TO: Dan Williams <dan.j.williams@...el.com>
:::::: CC: Andrew Morton <akpm@...ux-foundation.org>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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