[PATCH] __mod_page_state(): pass unsigned long instead of unsigned

By making the offset argument of __mod_page_state an unsigned long instead
of unsigned, we can avoid forcing the compiler to sign extend a usually
constant argument.  This saves 1 instruction on x86-64.

Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index df31389..f2ee9b2 100644 (file)
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -136,7 +136,7 @@ struct page_state {
 extern void get_page_state(struct page_state *ret);
 extern void get_full_page_state(struct page_state *ret);
 extern unsigned long __read_page_state(unsigned offset);
-extern void __mod_page_state(unsigned offset, unsigned long delta);
+extern void __mod_page_state(unsigned long offset, unsigned long delta);
 
 #define read_page_state(member) \
        __read_page_state(offsetof(struct page_state, member))

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 70f7102..c976628 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1158,7 +1158,7 @@ unsigned long __read_page_state(unsigned offset)
        return ret;
 }
 
-void __mod_page_state(unsigned offset, unsigned long delta)
+void __mod_page_state(unsigned long offset, unsigned long delta)
 {
        unsigned long flags;
        void* ptr;