pageflags: introduce macros to generate page flag functions (f94a62e9) · Commits · 戴 / test

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>

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
		*/

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