Commit ec7cade8 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

page flags: add PAGEFLAGS_FALSE for flags that are always false 



Turns out that there are a number of times that a flag is simply always
returning 0.  Define a macro for that.

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 602c4d11

include/linux/page-flags.h

+7 −12
Original line number Original line Diff line number Diff line
@@ -134,6 +134,10 @@ static inline int TestClearPage##uname(struct page *page) \ 
#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname)		\

#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname)		\

	__SETPAGEFLAG(uname, lname)  __CLEARPAGEFLAG(uname, lname)

	__SETPAGEFLAG(uname, lname)  __CLEARPAGEFLAG(uname, lname)





#define PAGEFLAG_FALSE(uname) 						\

static inline int Page##uname(struct page *page) 			\

			{ return 0; }



#define TESTSCFLAG(uname, lname)					\

#define TESTSCFLAG(uname, lname)					\

	TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname)

	TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname)
@@ -171,28 +175,19 @@ PAGEFLAG(Readahead, reclaim) /* Reminder to do async read-ahead */ 
 */

 */

#define PageHighMem(__p) is_highmem(page_zone(__p))

#define PageHighMem(__p) is_highmem(page_zone(__p))

#else

#else

static inline int PageHighMem(struct page *page)

PAGEFLAG_FALSE(HighMem)

{

	return 0;

}

#endif

#endif





#ifdef CONFIG_SWAP

#ifdef CONFIG_SWAP

PAGEFLAG(SwapCache, swapcache)

PAGEFLAG(SwapCache, swapcache)

#else

#else

static inline int PageSwapCache(struct page *page)

PAGEFLAG_FALSE(SwapCache)

{

	return 0;

}

#endif

#endif





#ifdef CONFIG_IA64_UNCACHED_ALLOCATOR

#ifdef CONFIG_IA64_UNCACHED_ALLOCATOR

PAGEFLAG(Uncached, uncached)

PAGEFLAG(Uncached, uncached)

#else

#else

static inline int PageUncached(struct page *)

PAGEFLAG_FALSE(Uncached)

{

	return 0;

}

#endif

#endif





static inline int PageUptodate(struct page *page)

static inline int PageUptodate(struct page *page)