linux-kernel - Re: [PATCH 2/4] elf: use list_for_each

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Date:   Tue, 12 Feb 2019 23:49:51 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     kbuild-all@...org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] elf: use list_for_each_entry()

Hi Alexey,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.0-rc4]
[cannot apply to next-20190212]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Alexey-Dobriyan/elf-don-t-be-afraid-of-overflow/20190205-225931
config: nds32-defconfig (attached as .config)
compiler: nds32le-linux-gcc (GCC) 6.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=6.4.0 make.cross ARCH=nds32 

All errors (new ones prefixed by >>):

   fs/binfmt_elf.c: In function 'write_note_info':
>> fs/binfmt_elf.c:2124:19: error: 'tmp' undeclared (first use in this function)
      for (i = 0; i < tmp->num_notes; i++)
                      ^~~
   fs/binfmt_elf.c:2124:19: note: each undeclared identifier is reported only once for each function it appears in

vim +/tmp +2124 fs/binfmt_elf.c

3aba481f Roland McGrath  2008-01-30  2111  
3aba481f Roland McGrath  2008-01-30  2112  static int write_note_info(struct elf_note_info *info,
ecc8c772 Al Viro         2013-10-05  2113  			   struct coredump_params *cprm)
3aba481f Roland McGrath  2008-01-30  2114  {
1e0d184d Alexey Dobriyan 2019-02-04  2115  	struct elf_thread_status *ets;
3aba481f Roland McGrath  2008-01-30  2116  	int i;
3aba481f Roland McGrath  2008-01-30  2117  
3aba481f Roland McGrath  2008-01-30  2118  	for (i = 0; i < info->numnote; i++)
ecc8c772 Al Viro         2013-10-05  2119  		if (!writenote(info->notes + i, cprm))
3aba481f Roland McGrath  2008-01-30  2120  			return 0;
3aba481f Roland McGrath  2008-01-30  2121  
3aba481f Roland McGrath  2008-01-30  2122  	/* write out the thread status notes section */
1e0d184d Alexey Dobriyan 2019-02-04  2123  	list_for_each_entry(ets, &info->thread_list, list) {
3aba481f Roland McGrath  2008-01-30 @2124  		for (i = 0; i < tmp->num_notes; i++)
ecc8c772 Al Viro         2013-10-05  2125  			if (!writenote(&tmp->notes[i], cprm))
3aba481f Roland McGrath  2008-01-30  2126  				return 0;
3aba481f Roland McGrath  2008-01-30  2127  	}
3aba481f Roland McGrath  2008-01-30  2128  
3aba481f Roland McGrath  2008-01-30  2129  	return 1;
3aba481f Roland McGrath  2008-01-30  2130  }
3aba481f Roland McGrath  2008-01-30  2131  

:::::: The code at line 2124 was first introduced by commit
:::::: 3aba481fc94d83ff630d4b7cd2f7447010c4c6df elf core dump: notes reorg

:::::: TO: Roland McGrath <roland@...hat.com>
:::::: CC: Ingo Molnar <mingo@...e.hu>

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