linux-kernel - [PATCH] sh: provide unxlate_dev_mem

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Message-Id: <20230704190144.2888679-1-linux@roeck-us.net>
Date:   Tue,  4 Jul 2023 12:01:44 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc:     Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH] sh: provide unxlate_dev_mem_ptr() in asm/io.h

The unxlate_dev_mem_ptr() function has no prototype on the sh architecture,
which does not include asm-generic/io.h. This results in the following
build failure.

drivers/char/mem.c: In function 'read_mem':
drivers/char/mem.c:164:25: error: implicit declaration of function 'unxlate_dev_mem_ptr'

This compile error is now seen because commit 99b619b37ae1 ("mips: provide
unxlate_dev_mem_ptr() in asm/io.h") removed the weak function which was
previously in place to handle the problem.

Add a trivial macro to the sh header to provide the now missing dummy
function.

Fixes: 99b619b37ae1 ("mips: provide unxlate_dev_mem_ptr() in asm/io.h")
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 arch/sh/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index fba90e670ed4..d8f3537ef57f 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -286,6 +286,7 @@ static inline void iounmap(volatile void __iomem *addr) { }
  * access
  */
 #define xlate_dev_mem_ptr(p)	__va(p)
+#define unxlate_dev_mem_ptr(p, v) do { } while (0)
 
 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
 int valid_phys_addr_range(phys_addr_t addr, size_t size);
-- 
2.39.2