Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCH 14/16] page-flags: define PG_uptodate behavior on compound pages | Date | Thu, 19 Mar 2015 19:08:20 +0200 |
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We use PG_uptodate on head pages on transparent huge page. Let's use NO_TAIL.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- include/linux/page-flags.h | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 0b6921d2f2f3..55a69c40e4ae 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -408,8 +408,9 @@ u64 stable_page_flags(struct page *page); static inline int PageUptodate(struct page *page) { - int ret = test_bit(PG_uptodate, &(page)->flags); - + int ret; + page = compound_head(page); + ret = test_bit(PG_uptodate, &(page)->flags); /* * Must ensure that the data we read out of the page is loaded * _after_ we've loaded page->flags to check for PageUptodate. @@ -426,12 +427,14 @@ static inline int PageUptodate(struct page *page) static inline void __SetPageUptodate(struct page *page) { + VM_BUG_ON_PAGE(PageTail(page), page); smp_wmb(); __set_bit(PG_uptodate, &page->flags); } static inline void SetPageUptodate(struct page *page) { + VM_BUG_ON_PAGE(PageTail(page), page); /* * Memory barrier must be issued before setting the PG_uptodate bit, * so that all previous stores issued in order to bring the page @@ -441,7 +444,7 @@ static inline void SetPageUptodate(struct page *page) set_bit(PG_uptodate, &page->flags); } -CLEARPAGEFLAG(Uptodate, uptodate, ANY) +CLEARPAGEFLAG(Uptodate, uptodate, NO_TAIL) int test_clear_page_writeback(struct page *page); int __test_set_page_writeback(struct page *page, bool keep_write); -- 2.1.4
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