linux-kernel - [PATCH] mm: Fix warning

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Date:	Wed, 22 May 2013 12:18:47 +0200
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-mips@...ux-mips.org, Eunbong Song <eunb.song@...sung.com>
Subject: [PATCH] mm: Fix warning

virt_to_page() is typically implemented as a macro containing a cast so
it'll accept both pointers and unsigned long without causing a warning.
MIPS virt_to_page() uses virt_to_phys which is a function so passing an
unsigned long will cause a warning:

  CC      mm/page_alloc.o
/home/ralf/src/linux/linux-mips/mm/page_alloc.c: In function ‘free_reserved_area’:
/home/ralf/src/linux/linux-mips/mm/page_alloc.c:5161:3: warning: passing argument 1 of ‘virt_to_phys’ makes pointer from integer without a cast [enabled by default]
In file included from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/page.h:153:0,
                 from /home/ralf/src/linux/linux-mips/include/linux/mmzone.h:20,
                 from /home/ralf/src/linux/linux-mips/include/linux/gfp.h:4,
                 from /home/ralf/src/linux/linux-mips/include/linux/mm.h:8,
                 from /home/ralf/src/linux/linux-mips/mm/page_alloc.c:18:
/home/ralf/src/linux/linux-mips/arch/mips/include/asm/io.h:119:100: note: expected ‘const volatile void *’ but argument is of type ‘long unsigned int’

All others users of virt_to_page() in mm/ are passing a void *.

Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Reported-by: Eunbong Song <eunb.song@...sung.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org
Cc: linux-mips@...ux-mips.org
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 98cbdf6..378a15b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5158,7 +5158,7 @@ unsigned long free_reserved_area(unsigned long start, unsigned long end,
 	for (pages = 0; pos < end; pos += PAGE_SIZE, pages++) {
 		if (poison)
 			memset((void *)pos, poison, PAGE_SIZE);
-		free_reserved_page(virt_to_page(pos));
+		free_reserved_page(virt_to_page((void *)pos));
 	}
 
 	if (pages && s)
--
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