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[PATCH] mm: Fix warning

To: Linus Torvalds <>
Subject: [PATCH] mm: Fix warning
From: Ralf Baechle <>
Date: Wed, 22 May 2013 12:18:47 +0200
Cc:,,, Eunbong Song <>
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Original-recipient: rfc822;
User-agent: Mutt/1.5.21 (2010-09-15)
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 
/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 
                 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 <>
Reported-by: Eunbong Song <>
Cc: Linus Torvalds <>
 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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