[gfs2:for-next 19/20] fs/ocfs2/aops.c:878:7: error: call to undeclared function 'page_has_buffers'; ISO C99 and later do not support implicit function declarations

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next
head:   16abce10ad13ab3ee23754a81164aa8d0506d552
commit: b3cbb48767a2c7a9348b13852b75ea01ed52017b [19/20] gfs2: Convert gfs2_end_log_write_bh() to work on a folio
config: arm-randconfig-003-20250309 (https://download.01.org/0day-ci/archive/20250309/202503092338.i0AkxoMV-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project e15545cad8297ec7555f26e5ae74a9f0511203e7)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250309/202503092338.i0AkxoMV-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503092338.i0AkxoMV-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/ocfs2/aops.c:878:7: error: call to undeclared function 'page_has_buffers'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     878 |         if (!page_has_buffers(page))
         |              ^
   fs/ocfs2/aops.c:878:7: note: did you mean 'inode_has_buffers'?
   include/linux/buffer_head.h:511:5: note: 'inode_has_buffers' declared here
     511 | int inode_has_buffers(struct inode *inode);
         |     ^
   fs/ocfs2/aops.c:927:18: error: call to undeclared function 'page_has_buffers'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     927 |                 if (tmppage && page_has_buffers(tmppage)) {
         |                                ^
   fs/ocfs2/aops.c:2025:7: error: call to undeclared function 'page_has_buffers'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2025 |                 if (page_has_buffers(tmppage)) {
         |                     ^
   3 errors generated.
--
>> fs/ocfs2/refcounttree.c:2969:7: error: call to undeclared function 'page_has_buffers'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2969 |                 if (page_has_buffers(page)) {
         |                     ^
   fs/ocfs2/refcounttree.c:2969:7: note: did you mean 'inode_has_buffers'?
   include/linux/buffer_head.h:511:5: note: 'inode_has_buffers' declared here
     511 | int inode_has_buffers(struct inode *inode);
         |     ^
   1 error generated.


vim +/page_has_buffers +878 fs/ocfs2/aops.c

6af67d8205cf65 Mark Fasheh       2007-03-06  866  
9517bac6cc7a7a Mark Fasheh       2007-02-09  867  /*
3a307ffc2730bf Mark Fasheh       2007-05-08  868   * If a page has any new buffers, zero them out here, and mark them uptodate
3a307ffc2730bf Mark Fasheh       2007-05-08  869   * and dirty so they'll be written out (in order to prevent uninitialised
3a307ffc2730bf Mark Fasheh       2007-05-08  870   * block data from leaking). And clear the new bit.
9517bac6cc7a7a Mark Fasheh       2007-02-09  871   */
3a307ffc2730bf Mark Fasheh       2007-05-08  872  static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
9517bac6cc7a7a Mark Fasheh       2007-02-09  873  {
3a307ffc2730bf Mark Fasheh       2007-05-08  874  	unsigned int block_start, block_end;
3a307ffc2730bf Mark Fasheh       2007-05-08  875  	struct buffer_head *head, *bh;
9517bac6cc7a7a Mark Fasheh       2007-02-09  876  
3a307ffc2730bf Mark Fasheh       2007-05-08  877  	BUG_ON(!PageLocked(page));
3a307ffc2730bf Mark Fasheh       2007-05-08 @878  	if (!page_has_buffers(page))
3a307ffc2730bf Mark Fasheh       2007-05-08  879  		return;
9517bac6cc7a7a Mark Fasheh       2007-02-09  880  
3a307ffc2730bf Mark Fasheh       2007-05-08  881  	bh = head = page_buffers(page);
3a307ffc2730bf Mark Fasheh       2007-05-08  882  	block_start = 0;
3a307ffc2730bf Mark Fasheh       2007-05-08  883  	do {
3a307ffc2730bf Mark Fasheh       2007-05-08  884  		block_end = block_start + bh->b_size;
9517bac6cc7a7a Mark Fasheh       2007-02-09  885  
3a307ffc2730bf Mark Fasheh       2007-05-08  886  		if (buffer_new(bh)) {
3a307ffc2730bf Mark Fasheh       2007-05-08  887  			if (block_end > from && block_start < to) {
3a307ffc2730bf Mark Fasheh       2007-05-08  888  				if (!PageUptodate(page)) {
3a307ffc2730bf Mark Fasheh       2007-05-08  889  					unsigned start, end;
9517bac6cc7a7a Mark Fasheh       2007-02-09  890  
3a307ffc2730bf Mark Fasheh       2007-05-08  891  					start = max(from, block_start);
3a307ffc2730bf Mark Fasheh       2007-05-08  892  					end = min(to, block_end);
9517bac6cc7a7a Mark Fasheh       2007-02-09  893  
eebd2aa355692a Christoph Lameter 2008-02-04  894  					zero_user_segment(page, start, end);
3a307ffc2730bf Mark Fasheh       2007-05-08  895  					set_buffer_uptodate(bh);
3a307ffc2730bf Mark Fasheh       2007-05-08  896  				}
eeb47d1234af1a Mark Fasheh       2007-06-06  897  
3a307ffc2730bf Mark Fasheh       2007-05-08  898  				clear_buffer_new(bh);
3a307ffc2730bf Mark Fasheh       2007-05-08  899  				mark_buffer_dirty(bh);
3a307ffc2730bf Mark Fasheh       2007-05-08  900  			}
9517bac6cc7a7a Mark Fasheh       2007-02-09  901  		}
9517bac6cc7a7a Mark Fasheh       2007-02-09  902  
3a307ffc2730bf Mark Fasheh       2007-05-08  903  		block_start = block_end;
3a307ffc2730bf Mark Fasheh       2007-05-08  904  		bh = bh->b_this_page;
3a307ffc2730bf Mark Fasheh       2007-05-08  905  	} while (bh != head);
3a307ffc2730bf Mark Fasheh       2007-05-08  906  }
9517bac6cc7a7a Mark Fasheh       2007-02-09  907  

:::::: The code at line 878 was first introduced by commit
:::::: 3a307ffc2730bfa1a4dfa94537be9d412338aad2 ocfs2: rework ocfs2_buffered_write_cluster()

:::::: TO: Mark Fasheh <mark.fasheh@oracle.com>
:::::: CC: Mark Fasheh <mark.fasheh@oracle.com>

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