Messages in this thread Patch in this message | | | Date | Fri, 29 Feb 2008 20:05:36 -0800 | From | Christoph Lameter <> | Subject | [rfc 02/10] Pageflags: Introduce macros to generate page flag functions |
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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 TESTPAGEFLAG Create additional atomic set function SETPAGEFLAG Create additional atomic clear function __TESTPAGEFLAG Create additional atomic set function __SETPAGEFLAG Create additional atomic clear function
Signed-off-by: Christoph Lameter <clameter@sgi.com>
--- include/linux/page-flags.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+)
Index: linux-2.6/include/linux/page-flags.h =================================================================== --- linux-2.6.orig/include/linux/page-flags.h 2008-02-29 19:14:30.000000000 -0800 +++ linux-2.6/include/linux/page-flags.h 2008-02-29 19:15:28.000000000 -0800 @@ -103,6 +103,47 @@ enum pageflags { }; /* + * 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); } + +#define SETPAGEFLAG(uname, lname) \ +static inline void SetPage##uname(struct page *page) \ + { set_bit(PG_##lname, page); } + +#define CLEARPAGEFLAG(uname, lname) \ +static inline void ClearPage##uname(struct page *page) \ + { clear_bit(PG_##lname, page); } + +#define __SETPAGEFLAG(uname, lname) \ +static inline void __SetPage##uname(struct page *page) \ + { __set_bit(PG_##lname, page); } + +#define __CLEARPAGEFLAG(uname, lname) \ +static inline void __ClearPage##uname(struct page *page) \ + { __clear_bit(PG_##lname, page); } + +#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) \ --
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