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: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 17deafa..d16efa9 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -134,6 +134,10 @@
#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(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) \
TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname)
@@ -171,28 +175,19 @@
*/
#define PageHighMem(__p) is_highmem(page_zone(__p))
#else
-static inline int PageHighMem(struct page *page)
-{
- return 0;
-}
+PAGEFLAG_FALSE(HighMem)
#endif
#ifdef CONFIG_SWAP
PAGEFLAG(SwapCache, swapcache)
#else
-static inline int PageSwapCache(struct page *page)
-{
- return 0;
-}
+PAGEFLAG_FALSE(SwapCache)
#endif
#ifdef CONFIG_IA64_UNCACHED_ALLOCATOR
PAGEFLAG(Uncached, uncached)
#else
-static inline int PageUncached(struct page *)
-{
- return 0;
-}
+PAGEFLAG_FALSE(Uncached)
#endif
static inline int PageUptodate(struct page *page)