linux-kernel - [amir73il:sb_iostats 4/8] include/linux/fs.h:3686:1: error: non-void function does not return a value in all control paths

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Message-ID: <202203011714.24Dz5EuE-lkp@intel.com>
Date:   Tue, 1 Mar 2022 17:14:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     Amir Goldstein <amir73il@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [amir73il:sb_iostats 4/8] include/linux/fs.h:3686:1: error: non-void
 function does not return a value in all control paths

tree:   https://github.com/amir73il/linux sb_iostats
head:   ecfdb413f2105083296e9cb45290eb1f01b0ef5c
commit: 8b022d3080d57a2a42917c1b36d7b4c27a4fac4e [4/8] fs: add iostats counters to struct super_block
config: x86_64-allmodconfig (https://download.01.org/0day-ci/archive/20220301/202203011714.24Dz5EuE-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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
        # https://github.com/amir73il/linux/commit/8b022d3080d57a2a42917c1b36d7b4c27a4fac4e
        git remote add amir73il https://github.com/amir73il/linux
        git fetch --no-tags amir73il sb_iostats
        git checkout 8b022d3080d57a2a42917c1b36d7b4c27a4fac4e
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 prepare

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

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/asm-offsets.c:13:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:17:
>> include/linux/fs.h:3686:1: error: non-void function does not return a value in all control paths [-Werror,-Wreturn-type]
   }
   ^
   1 error generated.
   make[2]: *** [scripts/Makefile.build:121: arch/x86/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1191: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:219: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +3686 include/linux/fs.h

  3681	
  3682	static inline s64 sb_iostats_counter_read(struct super_block *sb, int id)
  3683	{
  3684		if (sb_has_iostats(sb))
  3685			return percpu_counter_sum_positive(&sb->s_iostats.counter[id]);
> 3686	}
  3687	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org