linux-kernel - [PATCH 1/2] mips: provide unxlate_dev_mem

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Message-Id: <20230516194000.548487-1-arnd@kernel.org>
Date:   Tue, 16 May 2023 21:39:42 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] mips: provide unxlate_dev_mem_ptr() in asm/io.h

From: Arnd Bergmann <arnd@...db.de>

The unxlate_dev_mem_ptr() function has no prototype on the mips
architecture, which does not include asm-generic/io.h, so gcc warns
about the __weak definition:

drivers/char/mem.c:94:29: error: no previous prototype for 'unxlate_dev_mem_ptr' [-Werror=missing-prototypes]

Since everyone else already gets the generic definition or has a custom
one, there is not really much point in having a __weak version as well.

Remove this one, and instead add a trivial macro to the mips header.
Once we convert mips to use the asm-generic header, this can go away
again.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/mips/include/asm/io.h | 1 +
 drivers/char/mem.c         | 7 -------
 2 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index cc28d207a061..affd21e9c20b 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -554,6 +554,7 @@ extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
  * access
  */
 #define xlate_dev_mem_ptr(p)	__va(p)
+#define unxlate_dev_mem_ptr(p, v) do { } while (0)
 
 void __ioread64_copy(void *to, const void __iomem *from, size_t count);
 
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index f494d31f2b98..94eff6a2a7b6 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -90,13 +90,6 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
 }
 #endif
 
-#ifndef unxlate_dev_mem_ptr
-#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
-void __weak unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
-{
-}
-#endif
-
 static inline bool should_stop_iteration(void)
 {
 	if (need_resched())
-- 
2.39.2