tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git dma-sync-rework head: 985cd64f3b17b82468e68c6269e09a5556d3720e commit: 9a711fbea373208c1eeb2fafb0c744bc23a79a43 [20/20] dma-mapping: replace custom code with generic implementation config: nios2-defconfig (https://download.01.org/0day-ci/archive/20230325/202303251037.tsdm8i6z-lkp@xxxxxxxxx/config) compiler: nios2-linux-gcc (GCC) 12.1.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git/commit/?id=9a711fbea373208c1eeb2fafb0c744bc23a79a43 git remote add arnd-asm-generic https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git git fetch --no-tags arnd-asm-generic dma-sync-rework git checkout 9a711fbea373208c1eeb2fafb0c744bc23a79a43 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=nios2 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=nios2 SHELL=/bin/bash arch/nios2/mm/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202303251037.tsdm8i6z-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from arch/nios2/mm/dma-mapping.c:53: >> include/linux/dma-sync.h:24:6: warning: no previous prototype for 'arch_sync_dma_for_device' [-Wmissing-prototypes] 24 | void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, | ^~~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/dma-sync.h:86:6: warning: no previous prototype for 'arch_sync_dma_for_cpu' [-Wmissing-prototypes] 86 | void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, | ^~~~~~~~~~~~~~~~~~~~~ arch/nios2/mm/dma-mapping.c:55:6: warning: no previous prototype for 'arch_dma_prep_coherent' [-Wmissing-prototypes] 55 | void arch_dma_prep_coherent(struct page *page, size_t size) | ^~~~~~~~~~~~~~~~~~~~~~ arch/nios2/mm/dma-mapping.c:62:7: warning: no previous prototype for 'arch_dma_set_uncached' [-Wmissing-prototypes] 62 | void *arch_dma_set_uncached(void *ptr, size_t size) | ^~~~~~~~~~~~~~~~~~~~~ vim +/arch_sync_dma_for_device +24 include/linux/dma-sync.h > 24 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, 25 enum dma_data_direction dir) 26 { 27 switch (dir) { 28 case DMA_TO_DEVICE: 29 /* 30 * This may be an empty function on write-through caches, 31 * and it might invalidate the cache if an architecture has 32 * a write-back cache but no way to write it back without 33 * invalidating 34 */ 35 arch_dma_cache_wback(paddr, size); 36 break; 37 38 case DMA_FROM_DEVICE: 39 /* 40 * FIXME: this should be handled the same across all 41 * architectures, see 42 * https://lore.kernel.org/all/20220606152150.GA31568@willie-the-truck/ 43 */ 44 if (!arch_sync_dma_clean_before_fromdevice()) { 45 arch_dma_cache_inv(paddr, size); 46 break; 47 } 48 fallthrough; 49 50 case DMA_BIDIRECTIONAL: 51 /* Skip the invalidate here if it's done later */ 52 if (IS_ENABLED(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) && 53 arch_sync_dma_cpu_needs_post_dma_flush()) 54 arch_dma_cache_wback(paddr, size); 55 else 56 arch_dma_cache_wback_inv(paddr, size); 57 break; 58 59 default: 60 break; 61 } 62 } 63 64 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU 65 /* 66 * Mark the D-cache clean for these pages to avoid extra flushing. 67 */ 68 static void arch_dma_mark_dcache_clean(phys_addr_t paddr, size_t size) 69 { 70 #ifdef CONFIG_ARCH_DMA_MARK_DCACHE_CLEAN 71 unsigned long pfn = PFN_UP(paddr); 72 unsigned long off = paddr & (PAGE_SIZE - 1); 73 size_t left = size; 74 75 if (off) 76 left -= PAGE_SIZE - off; 77 78 while (left >= PAGE_SIZE) { 79 struct page *page = pfn_to_page(pfn++); 80 set_bit(PG_dcache_clean, &page->flags); 81 left -= PAGE_SIZE; 82 } 83 #endif 84 } 85 > 86 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
