[gfs2:for-next.bob6b 5/12] fs/gfs2/meta_io.c:400:21: warning: no previous prototype for function 'gfs2_getjdatabuf'

From: kernel test robot <lkp@intel.com>
To: kbuild-all@lists.01.org
Subject: [gfs2:for-next.bob6b 5/12] fs/gfs2/meta_io.c:400:21: warning: no previous prototype for function 'gfs2_getjdatabuf'
Date: Fri, 31 Jul 2020 10:05:02 +0800	[thread overview]
Message-ID: <202007311001.NcVgxLoI%lkp@intel.com> (raw)

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next.bob6b
head:   e113c11c3dacf984d0e6c6a53e78940727c2f52f
commit: 814995ea785119dac948329e509217d15ac6beb0 [5/12] gfs2: Wipe jdata and ail1 in gfs2_journal_wipe, formerly gfs2_meta_wipe
config: x86_64-randconfig-a016-20200730 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c23ae3f18ee3ff11671f4c62ffc66d150b1bcdc2)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 814995ea785119dac948329e509217d15ac6beb0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> fs/gfs2/meta_io.c:400:21: warning: no previous prototype for function 'gfs2_getjdatabuf' [-Wmissing-prototypes]
   struct buffer_head *gfs2_getjdatabuf(struct gfs2_inode *ip, u64 blkno)
                       ^
   fs/gfs2/meta_io.c:400:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct buffer_head *gfs2_getjdatabuf(struct gfs2_inode *ip, u64 blkno)
   ^
   static 
   1 warning generated.

vim +/gfs2_getjdatabuf +400 fs/gfs2/meta_io.c

   399	
 > 400	struct buffer_head *gfs2_getjdatabuf(struct gfs2_inode *ip, u64 blkno)
   401	{
   402		struct address_space *mapping = ip->i_inode.i_mapping;
   403		struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
   404		struct page *page;
   405		struct buffer_head *bh;
   406		unsigned int shift = PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift;
   407		unsigned long index = blkno >> shift; /* convert block to page */
   408		unsigned int bufnum = blkno - (index << shift);
   409	
   410		page = find_get_page_flags(mapping, index, FGP_LOCK|FGP_ACCESSED);
   411		if (!page)
   412			return NULL;
   413		if (!page_has_buffers(page)) {
   414			unlock_page(page);
   415			put_page(page);
   416			return NULL;
   417		}
   418		/* Locate header for our buffer within our page */
   419		for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
   420			/* Do nothing */;
   421		get_bh(bh);
   422		unlock_page(page);
   423		put_page(page);
   424		return bh;
   425	}
   426	

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

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