tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   5d74e104f9872d5fe45c56f5cafd1fc44c6f2676
commit: 69f9dba0447d9b3876b9be77f05f3a50f41bf258 [202/445] drivers: dma-coherent: add initialization from device tree
config: arm-omap2plus_defconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout 69f9dba0447d9b3876b9be77f05f3a50f41bf258
  # save the attached .config to linux build tree
  make.cross ARCH=arm 

All warnings:

>> drivers/base/dma-coherent.c:303:2: warning: initialization from incompatible pointer type
     .device_init = rmem_dma_device_init,
     ^
>> drivers/base/dma-coherent.c:303:2: warning: (near initialization for 'rmem_dma_ops.device_init')

vim +303 drivers/base/dma-coherent.c

   287			pr_info("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
   288				&rmem->base, (unsigned long)rmem->size / SZ_1M);
   289			return -ENODEV;
   290		}
   291		rmem->priv = mem;
   292		dma_assign_coherent_memory(dev, mem);
   293		return 0;
   294	}
   295	
   296	static void rmem_dma_device_release(struct reserved_mem *rmem,
   297					    struct device *dev)
   298	{
   299		dev->dma_mem = NULL;
   300	}
   301	
   302	static const struct reserved_mem_ops rmem_dma_ops = {
 > 303		.device_init	= rmem_dma_device_init,
   304		.device_release	= rmem_dma_device_release,
   305	};
   306	
   307	static int __init rmem_dma_setup(struct reserved_mem *rmem)
   308	{
   309		unsigned long node = rmem->fdt_node;
   310	
   311		if (of_get_flat_dt_prop(node, "reusable", NULL))

---
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