Hi Huacai, [auto build test ERROR on mmotm/master] [also build test ERROR on v4.13 next-20170908] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Huacai-Chen/mm-dmapool-Align-to-ARCH_DMA_MINALIGN-in-non-coherent-DMA-mode/20170909-230504 base: git://git.cmpxchg.org/linux-mmotm.git master config: i386-tinyconfig (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): mm/dmapool.c: In function 'dma_pool_create': >> mm/dmapool.c:143:7: error: implicit declaration of function 'plat_device_is_coherent' [-Werror=implicit-function-declaration] if (!plat_device_is_coherent(dev)) ^~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/plat_device_is_coherent +143 mm/dmapool.c 109 110 /** 111 * dma_pool_create - Creates a pool of consistent memory blocks, for dma. 112 * @name: name of pool, for diagnostics 113 * @dev: device that will be doing the DMA 114 * @size: size of the blocks in this pool. 115 * @align: alignment requirement for blocks; must be a power of two 116 * @boundary: returned blocks won't cross this power of two boundary 117 * Context: !in_interrupt() 118 * 119 * Returns a dma allocation pool with the requested characteristics, or 120 * null if one can't be created. Given one of these pools, dma_pool_alloc() 121 * may be used to allocate memory. Such memory will all have "consistent" 122 * DMA mappings, accessible by the device and its driver without using 123 * cache flushing primitives. The actual size of blocks allocated may be 124 * larger than requested because of alignment. 125 * 126 * If @boundary is nonzero, objects returned from dma_pool_alloc() won't 127 * cross that size boundary. This is useful for devices which have 128 * addressing restrictions on individual DMA transfers, such as not crossing 129 * boundaries of 4KBytes. 130 */ 131 struct dma_pool *dma_pool_create(const char *name, struct device *dev, 132 size_t size, size_t align, size_t boundary) 133 { 134 struct dma_pool *retval; 135 size_t allocation; 136 bool empty = false; 137 138 if (align == 0) 139 align = 1; 140 else if (align & (align - 1)) 141 return NULL; 142 > 143 if (!plat_device_is_coherent(dev)) 144 align = max_t(size_t, align, dma_get_cache_alignment()); 145 146 if (size == 0) 147 return NULL; 148 else if (size < 4) 149 size = 4; 150 151 if ((size % align) != 0) 152 size = ALIGN(size, align); 153 154 allocation = max_t(size_t, size, PAGE_SIZE); 155 156 if (!boundary) 157 boundary = allocation; 158 else if ((boundary < size) || (boundary & (boundary - 1))) 159 return NULL; 160 161 retval = kmalloc_node(sizeof(*retval), GFP_KERNEL, dev_to_node(dev)); 162 if (!retval) 163 return retval; 164 165 strlcpy(retval->name, name, sizeof(retval->name)); 166 167 retval->dev = dev; 168 169 INIT_LIST_HEAD(&retval->page_list); 170 spin_lock_init(&retval->lock); 171 retval->size = size; 172 retval->boundary = boundary; 173 retval->allocation = allocation; 174 175 INIT_LIST_HEAD(&retval->pools); 176 177 /* 178 * pools_lock ensures that the ->dma_pools list does not get corrupted. 179 * pools_reg_lock ensures that there is not a race between 180 * dma_pool_create() and dma_pool_destroy() or within dma_pool_create() 181 * when the first invocation of dma_pool_create() failed on 182 * device_create_file() and the second assumes that it has been done (I 183 * know it is a short window). 184 */ 185 mutex_lock(&pools_reg_lock); 186 mutex_lock(&pools_lock); 187 if (list_empty(&dev->dma_pools)) 188 empty = true; 189 list_add(&retval->pools, &dev->dma_pools); 190 mutex_unlock(&pools_lock); 191 if (empty) { 192 int err; 193 194 err = device_create_file(dev, &dev_attr_pools); 195 if (err) { 196 mutex_lock(&pools_lock); 197 list_del(&retval->pools); 198 mutex_unlock(&pools_lock); 199 mutex_unlock(&pools_reg_lock); 200 kfree(retval); 201 return NULL; 202 } 203 } 204 mutex_unlock(&pools_reg_lock); 205 return retval; 206 } 207 EXPORT_SYMBOL(dma_pool_create); 208 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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