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Commit f94a62e9 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

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: default avatarChristoph 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9223b419

include/linux/page-flags.h

+41 −0
Original line number Diff line number Diff line
@@ -108,6 +108,47 @@ 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

 */