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(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 | 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 :::::: CC: Andrew Morton -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki