[PATCH] sh: prevent warnings when using iounmap

[Sam Ravnborg]

When building drm/exynos for sh, as part of an allmodconfig build,
the following warning triggered:

  exynos7_drm_decon.c: In function âdecon_removeâ:
  exynos7_drm_decon.c:769:24: warning: unused variable âctxâ
    struct decon_context *ctx = dev_get_drvdata(&pdev->dev);

The ctx variable is only used as argument to iounmap().

In sh - allmodconfig CONFIG_MMU is not defined
so it ended up in:

\#define __iounmap(addr)	do { } while (0)
\#define iounmap		__iounmap

Fix the warning by introducing a static inline
function for iounmap.
This is similar to several other architectures.

Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Cc: linux-sh@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 arch/sh/include/asm/io.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index c28e37a344ad..ac0561960c52 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -369,7 +369,11 @@ static inline int iounmap_fixed(void __iomem *addr) { return -EINVAL; }
 
 #define ioremap_nocache	ioremap
 #define ioremap_uc	ioremap
-#define iounmap		__iounmap
+
+static inline void iounmap(void __iomem *addr)
+{
+	__iounmap(addr);
+}
 
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
-- 
2.20.1