tree: https://android.googlesource.com/kernel/common android-mainline head: 8e1ec97355ef9927e82ec18c98312bdcd80bf289 commit: 349e8360c9c85c907147ea2d1d4716468409f2ab [3/4] ANDROID: dma-heap: Rework allocation calls to return struct dma_buf instead of fd config: x86_64-randconfig-a002-20200820 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b587ca93be114d07ec3bf654add97d7872325281) 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 349e8360c9c85c907147ea2d1d4716468409f2ab # 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(a)intel.com&gt; All warnings (new ones prefixed by >>): struct dma_buf *cma_heap_allocate(struct dma_heap *heap, ^ drivers/dma-buf/heaps/cma_heap.c:43:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct dma_buf *cma_heap_allocate(struct dma_heap *heap, ^ static 1 warning generated. git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android-mainline git checkout 349e8360c9c85c907147ea2d1d4716468409f2ab vim +/cma_heap_allocate +43 drivers/dma-buf/heaps/cma_heap.c 41 42 /* dmabuf heap CMA operations functions */ 44 unsigned long len, 45 unsigned long fd_flags, 46 unsigned long heap_flags) 47 { 48 struct cma_heap *cma_heap = dma_heap_get_drvdata(heap); 49 struct heap_helper_buffer *helper_buffer; 50 struct page *cma_pages; 51 size_t size = PAGE_ALIGN(len); 52 unsigned long nr_pages = size >> PAGE_SHIFT; 53 unsigned long align = get_order(size); 54 struct dma_buf *dmabuf; 55 int ret = -ENOMEM; 56 pgoff_t pg; 57 58 if (align > CONFIG_CMA_ALIGNMENT) 59 align = CONFIG_CMA_ALIGNMENT; 60 61 helper_buffer = kzalloc(sizeof(*helper_buffer), GFP_KERNEL); 62 if (!helper_buffer) 63 return ERR_PTR(-ENOMEM); 64 65 init_heap_helper_buffer(helper_buffer, cma_heap_free); 66 helper_buffer->heap = heap; 67 helper_buffer->size = len; 68 69 cma_pages = cma_alloc(cma_heap->cma, nr_pages, align, false); 70 if (!cma_pages) 71 goto free_buf; 72 73 if (PageHighMem(cma_pages)) { 74 unsigned long nr_clear_pages = nr_pages; 75 struct page *page = cma_pages; 76 77 while (nr_clear_pages > 0) { 78 void *vaddr = kmap_atomic(page); 79 80 memset(vaddr, 0, PAGE_SIZE); 81 kunmap_atomic(vaddr); 82 /* 83 * Avoid wasting time zeroing memory if the process 84 * has been killed by by SIGKILL 85 */ 86 if (fatal_signal_pending(current)) 87 goto free_cma; 88 89 page++; 90 nr_clear_pages--; 91 } 92 } else { 93 memset(page_address(cma_pages), 0, size); 94 } 95 96 helper_buffer->pagecount = nr_pages; 97 helper_buffer->pages = kmalloc_array(helper_buffer->pagecount, 98 sizeof(*helper_buffer->pages), 99 GFP_KERNEL); 100 if (!helper_buffer->pages) { 101 ret = -ENOMEM; 102 goto free_cma; 103 } 104 105 for (pg = 0; pg < helper_buffer->pagecount; pg++) 106 helper_buffer->pages[pg] = &cma_pages[pg]; 107 108 /* create the dmabuf */ 109 dmabuf = heap_helper_export_dmabuf(helper_buffer, fd_flags); 110 if (IS_ERR(dmabuf)) { 111 ret = PTR_ERR(dmabuf); 112 goto free_pages; 113 } 114 115 helper_buffer->dmabuf = dmabuf; 116 helper_buffer->priv_virt = cma_pages; 117 118 return dmabuf; 119 120 free_pages: 121 kfree(helper_buffer->pages); 122 free_cma: 123 cma_release(cma_heap->cma, cma_pages, nr_pages); 124 free_buf: 125 kfree(helper_buffer); 126 return ERR_PTR(ret); 127 } 128 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org