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authorChristoph Lameter <clameter@sgi.com>2008-04-28 02:12:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:22 -0700
commitf94a62e910840b3552c7adb7c57e0f8b3b345f6e (patch)
tree31444cdd24e640beea706d9b9f8da97f3a5c1639 /include
parent9223b4190fa1297a59f292f3419fc0285321d0ea (diff)
pageflags: introduce macros to generate page flag functions
Introduce a set of macros that generate functions to handle page flags. A page flag function group typically starts with either SETPAGEFLAG(<part of function name>,<part of PG_ flagname>) to create a set of page flag operations that are atomic. Or __SETPAGEFLAG(<part of function name>,<part of PG_ flagname) to create a set of page flag operations that are not atomic. Then additional operations can be added using the following macros TESTSCFLAG Create additional atomic test-and-set and test-and-clear functions TESTSETFLAG Create additional test and set function TESTCLEARFLAG Create additional test and clear function SETPAGEFLAG Create additional atomic set function CLEARPAGEFLAG Create additional atomic clear function __TESTPAGEFLAG Create additional non atomic set function __SETPAGEFLAG Create additional non atomic clear function Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Andy Whitcroft <apw@shadowen.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/page-flags.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 00e55e23b77..e5bddbfcf7a 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -109,6 +109,47 @@ enum pageflags {
#ifndef __GENERATING_BOUNDS_H
/*
+ * Macros to create function definitions for page flags
+ */
+#define TESTPAGEFLAG(uname, lname) \
+static inline int Page##uname(struct page *page) \
+ { return test_bit(PG_##lname, &page->flags); }
+
+#define SETPAGEFLAG(uname, lname) \
+static inline void SetPage##uname(struct page *page) \
+ { set_bit(PG_##lname, &page->flags); }
+
+#define CLEARPAGEFLAG(uname, lname) \
+static inline void ClearPage##uname(struct page *page) \
+ { clear_bit(PG_##lname, &page->flags); }
+
+#define __SETPAGEFLAG(uname, lname) \
+static inline void __SetPage##uname(struct page *page) \
+ { __set_bit(PG_##lname, &page->flags); }
+
+#define __CLEARPAGEFLAG(uname, lname) \
+static inline void __ClearPage##uname(struct page *page) \
+ { __clear_bit(PG_##lname, &page->flags); }
+
+#define TESTSETFLAG(uname, lname) \
+static inline int TestSetPage##uname(struct page *page) \
+ { return test_and_set_bit(PG_##lname, &page->flags); }
+
+#define TESTCLEARFLAG(uname, lname) \
+static inline int TestClearPage##uname(struct page *page) \
+ { return test_and_clear_bit(PG_##lname, &page->flags); }
+
+
+#define PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \
+ SETPAGEFLAG(uname, lname) CLEARPAGEFLAG(uname, lname)
+
+#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \
+ __SETPAGEFLAG(uname, lname) __CLEARPAGEFLAG(uname, lname)
+
+#define TESTSCFLAG(uname, lname) \
+ TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname)
+
+/*
* Manipulation of page state flags
*/
#define PageLocked(page) \