linux-kernel - [PATCH] ARM: samsung: improve static dma

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Date:	Thu, 12 May 2016 10:38:31 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Arnd Bergmann <arnd@...db.de>, Kukjin Kim <kgene@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: samsung: improve static dma_mask definition

When no DMA master devices are part of the kernel configuration,
we get a warning about the unused dma mask definition:

arch/arm/plat-samsung/devs.c:71:12: error: 'samsung_device_dma_mask' defined but not used [-Werror=unused-variable]
 static u64 samsung_device_dma_mask = DMA_BIT_MASK(32);

We could simply mark this as __maybe_unused to shut up that warning,
but a nicer solution seems to be to have a separate mask for each
device. The advantage is that a driver that happens to call
dma_set_mask() on one device doesn't implicitly change the mask
for the other devices as well. This is more of a theoretical
problem, as obviously nothing does it for the devices in this
file (or they would have always been broken), but it feels
cleaner that way.

The definition works by creating an array in place so we can take
the address of it and let the compiler generate a hidden symbol
for it at compile time.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/plat-samsung/devs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/plat-samsung/devs.c b/arch/arm/plat-samsung/devs.c
index 84baa16f4c0b..e93aa6734147 100644
--- a/arch/arm/plat-samsung/devs.c
+++ b/arch/arm/plat-samsung/devs.c
@@ -68,7 +68,7 @@
 #include <linux/platform_data/asoc-s3c.h>
 #include <linux/platform_data/spi-s3c64xx.h>

-static u64 samsung_device_dma_mask = DMA_BIT_MASK(32);
+#define samsung_device_dma_mask (*((u64[]) { DMA_BIT_MASK(32) }))

 /* AC97 */
 #ifdef CONFIG_CPU_S3C2440
-- 
2.7.0