[willy-pagecache:headers 17/21] drivers/gpu/drm/nouveau/nouveau_dmem.c:163:2: error: call to undeclared function 'folio_lock'; ISO C99 and later do not support implicit function declarations

[willy-pagecache:headers 17/21] drivers/gpu/drm/nouveau/nouveau_dmem.c:163:2: error: call to undeclared function 'folio_lock'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   git://git.infradead.org/users/willy/pagecache headers
head:   14ed95ee1eed0c72d54c159582017588ad1b2d68
commit: 1ca7605be521e2f15fe5667bbc65b7854f5d7737 [17/21] headers: Remove pagemap.h from swap.h
config: x86_64-randconfig-011-20260823 (https://download.01.org/0day-ci/archive/20260823/202608230822.sTidNfSE-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260823/202608230822.sTidNfSE-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/202608230822.sTidNfSE-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/nouveau/nouveau_dmem.c:163:2: error: call to undeclared function 'folio_lock'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     163 |         folio_lock(dfolio);
         |         ^
>> drivers/gpu/drm/nouveau/nouveau_dmem.c:435:2: error: call to undeclared function 'unlock_page'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     435 |         unlock_page(page);
         |         ^
   2 errors generated.


vim +/folio_lock +163 drivers/gpu/drm/nouveau/nouveau_dmem.c

2ab2bda53c986a Christoph Hellwig 2019-08-14  154  
c3228747107705 Balbir Singh      2025-10-01  155  static int nouveau_dmem_copy_folio(struct nouveau_drm *drm,
c3228747107705 Balbir Singh      2025-10-01  156  				   struct folio *sfolio, struct folio *dfolio,
c3228747107705 Balbir Singh      2025-10-01  157  				   struct nouveau_dmem_dma_info *dma_info)
5be73b690875f7 Jérôme Glisse     2018-07-26  158  {
a788ade4f6e030 Ben Skeggs        2019-02-15  159  	struct device *dev = drm->dev->dev;
c3228747107705 Balbir Singh      2025-10-01  160  	struct page *dpage = folio_page(dfolio, 0);
c3228747107705 Balbir Singh      2025-10-01  161  	struct page *spage = folio_page(sfolio, 0);
5be73b690875f7 Jérôme Glisse     2018-07-26  162  
c3228747107705 Balbir Singh      2025-10-01 @163  	folio_lock(dfolio);
5be73b690875f7 Jérôme Glisse     2018-07-26  164  
c3228747107705 Balbir Singh      2025-10-01  165  	dma_info->dma_addr = dma_map_page(dev, dpage, 0, page_size(dpage),
c3228747107705 Balbir Singh      2025-10-01  166  					DMA_BIDIRECTIONAL);
c3228747107705 Balbir Singh      2025-10-01  167  	dma_info->size = page_size(dpage);
c3228747107705 Balbir Singh      2025-10-01  168  	if (dma_mapping_error(dev, dma_info->dma_addr))
d9b719394a1147 Alistair Popple   2022-09-28  169  		return -EIO;
5be73b690875f7 Jérôme Glisse     2018-07-26  170  
c3228747107705 Balbir Singh      2025-10-01  171  	if (drm->dmem->migrate.copy_func(drm, folio_nr_pages(sfolio),
c3228747107705 Balbir Singh      2025-10-01  172  					 NOUVEAU_APER_HOST, dma_info->dma_addr,
c3228747107705 Balbir Singh      2025-10-01  173  					 NOUVEAU_APER_VRAM,
c3228747107705 Balbir Singh      2025-10-01  174  					 nouveau_dmem_page_addr(spage))) {
c3228747107705 Balbir Singh      2025-10-01  175  		dma_unmap_page(dev, dma_info->dma_addr, page_size(dpage),
c3228747107705 Balbir Singh      2025-10-01  176  					DMA_BIDIRECTIONAL);
d9b719394a1147 Alistair Popple   2022-09-28  177  		return -EIO;
d9b719394a1147 Alistair Popple   2022-09-28  178  	}
5be73b690875f7 Jérôme Glisse     2018-07-26  179  
bfe69ef94aeeae Christoph Hellwig 2019-08-14  180  	return 0;
5be73b690875f7 Jérôme Glisse     2018-07-26  181  }
5be73b690875f7 Jérôme Glisse     2018-07-26  182  

:::::: The code at line 163 was first introduced by commit
:::::: c3228747107705d47c7e9a03598a434a0380cb73 gpu/drm/nouveau: enable THP support for GPU memory migration

:::::: TO: Balbir Singh <balbirs@nvidia.com>
:::::: CC: Andrew Morton <akpm@linux-foundation.org>

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