[MIPS] Replace redundant declarations of _end by <asm/sections.h>.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/mips-boards/generic/memory.c b/arch/mips/mips-boards/generic/memory.c
index 32c9210..d3df1eb 100644
--- a/arch/mips/mips-boards/generic/memory.c
+++ b/arch/mips/mips-boards/generic/memory.c
@@ -26,6 +26,7 @@
 
 #include <asm/bootinfo.h>
 #include <asm/page.h>
+#include <asm/sections.h>
 
 #include <asm/mips-boards/prom.h>
 
@@ -46,9 +47,6 @@
 };
 #endif
 
-/* References to section boundaries */
-extern char _end;
-
 struct prom_pmemblock * __init prom_getmdesc(void)
 {
 	char *memsize_str;
@@ -106,7 +104,7 @@
 
 	mdesc[3].type = yamon_dontuse;
 	mdesc[3].base = 0x00100000;
-	mdesc[3].size = CPHYSADDR(PAGE_ALIGN(&_end)) - mdesc[3].base;
+	mdesc[3].size = CPHYSADDR(PAGE_ALIGN((unsigned long)&_end)) - mdesc[3].base;
 
 	mdesc[4].type = yamon_free;
 	mdesc[4].base = CPHYSADDR(PAGE_ALIGN(&_end));