[patch 016/147] sh: prevent warnings when using iounmap

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From: Sam Ravnborg <sam@xxxxxxxxxxxx>
Subject: sh: prevent warnings when using iounmap

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

  exynos7_drm_decon.c: In function `decon_remove':
  exynos7_drm_decon.c:769:24: warning: unused variable `ctx'
    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.

Link: http://lkml.kernel.org/r/20190622114208.24427-1-sam@xxxxxxxxxxxx
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 arch/sh/include/asm/io.h |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/arch/sh/include/asm/io.h~sh-prevent-warnings-when-using-iounmap
+++ a/arch/sh/include/asm/io.h
@@ -369,7 +369,11 @@ static inline int iounmap_fixed(void __i
 
 #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
_



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