MIPS: Octeon: Avoid empty-body warning

gcc-6 reports a harmless build warning:

arch/mips/cavium-octeon/dma-octeon.c: In function 'octeon_dma_alloc_coherent':
arch/mips/cavium-octeon/dma-octeon.c:179:3: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]

We can fix this by rearranging the code slightly using the
IS_ENABLED() macro.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/15048
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index fd69528..1226965 100644 (file)
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c
@@ -164,19 +164,14 @@ static void *octeon_dma_alloc_coherent(struct device *dev, size_t size,
        /* ignore region specifiers */
        gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
 
-#ifdef CONFIG_ZONE_DMA
-       if (dev == NULL)
+       if (IS_ENABLED(CONFIG_ZONE_DMA) && dev == NULL)
                gfp |= __GFP_DMA;
-       else if (dev->coherent_dma_mask <= DMA_BIT_MASK(24))
+       else if (IS_ENABLED(CONFIG_ZONE_DMA) &&
+                dev->coherent_dma_mask <= DMA_BIT_MASK(24))
                gfp |= __GFP_DMA;
-       else
-#endif
-#ifdef CONFIG_ZONE_DMA32
-            if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
+       else if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
+                dev->coherent_dma_mask <= DMA_BIT_MASK(32))
                gfp |= __GFP_DMA32;
-       else
-#endif
-               ;
 
        /* Don't invoke OOM killer */
        gfp |= __GFP_NORETRY;