[PATCH v2] sh: Convert nommu io{re,un}map() to static inline functions

From: Geert Uytterhoeven
Date: Mon Jun 20 2022 - 03:01:58 EST


Recently, nommu iounmap() was converted from a static inline function to
a macro again, basically reverting commit 4580ba4ad2e6b8dd ("sh: Convert
iounmap() macros to inline functions"). With -Werror, this leads to
build failures like:

drivers/iio/adc/xilinx-ams.c: In function ‘ams_iounmap_ps’:
drivers/iio/adc/xilinx-ams.c:1195:14: error: unused variable ‘ams’ [-Werror=unused-variable]
1195 | struct ams *ams = data;
| ^~~

Fix this by replacing the macros for ioremap() and iounmap() by static
inline functions, based on <asm-generic/io.h>.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Fixes: 13f1fc870dd74713 ("sh: move the ioremap implementation out of line")
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Acked-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
v2:
- Add Acked-by, Reviewed-by.

This is actually the third time this change was made, as Christoph
converted iounmap() to a macro before in commit 98c90e5ea34e98bd ("sh:
remove __iounmap"), reverting commit 733f0025f0fb43e3 ("sh: prevent
warnings when using iounmap").

Probably sh-nommu should include <asm-generic/io.h>, but that would
require a lot more changes.
---
arch/sh/include/asm/io.h | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index cf9a3ec32406f856..fba90e670ed41d48 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -271,8 +271,12 @@ static inline void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
#endif /* CONFIG_HAVE_IOREMAP_PROT */

#else /* CONFIG_MMU */
-#define iounmap(addr) do { } while (0)
-#define ioremap(offset, size) ((void __iomem *)(unsigned long)(offset))
+static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
+{
+ return (void __iomem *)(unsigned long)offset;
+}
+
+static inline void iounmap(volatile void __iomem *addr) { }
#endif /* CONFIG_MMU */

#define ioremap_uc ioremap
--
2.25.1