From: Miklos Szeredi Clean up messy conditional calling of test_clear_page_writeback() from both rotate_reclaimable_page() and end_page_writeback(). The only user of rotate_reclaimable_page() is end_page_writeback() so this is OK. Signed-off-by: Miklos Szeredi Signed-off-by: Andrew Morton --- include/linux/swap.h | 2 +- mm/filemap.c | 10 ++++++---- mm/swap.c | 37 ++++++++++++------------------------- 3 files changed, 19 insertions(+), 30 deletions(-) diff -puN include/linux/swap.h~mm-rotate_reclaimable_page-cleanup include/linux/swap.h --- a/include/linux/swap.h~mm-rotate_reclaimable_page-cleanup +++ a/include/linux/swap.h @@ -177,7 +177,7 @@ extern void activate_page(struct page *) extern void mark_page_accessed(struct page *); extern void lru_add_drain(void); extern int lru_add_drain_all(void); -extern int rotate_reclaimable_page(struct page *page); +extern void rotate_reclaimable_page(struct page *page); extern void swap_setup(void); /* linux/mm/vmscan.c */ diff -puN mm/filemap.c~mm-rotate_reclaimable_page-cleanup mm/filemap.c --- a/mm/filemap.c~mm-rotate_reclaimable_page-cleanup +++ a/mm/filemap.c @@ -576,10 +576,12 @@ EXPORT_SYMBOL(unlock_page); */ void end_page_writeback(struct page *page) { - if (!TestClearPageReclaim(page) || rotate_reclaimable_page(page)) { - if (!test_clear_page_writeback(page)) - BUG(); - } + if (TestClearPageReclaim(page)) + rotate_reclaimable_page(page); + + if (!test_clear_page_writeback(page)) + BUG(); + smp_mb__after_clear_bit(); wake_up_page(page, PG_writeback); } diff -puN mm/swap.c~mm-rotate_reclaimable_page-cleanup mm/swap.c --- a/mm/swap.c~mm-rotate_reclaimable_page-cleanup +++ a/mm/swap.c @@ -132,34 +132,21 @@ static void pagevec_move_tail(struct pag * Writeback is about to end against a page which has been marked for immediate * reclaim. If it still appears to be reclaimable, move it to the tail of the * inactive list. - * - * Returns zero if it cleared PG_writeback. */ -int rotate_reclaimable_page(struct page *page) +void rotate_reclaimable_page(struct page *page) { - struct pagevec *pvec; - unsigned long flags; - - if (PageLocked(page)) - return 1; - if (PageDirty(page)) - return 1; - if (PageActive(page)) - return 1; - if (!PageLRU(page)) - return 1; - - page_cache_get(page); - local_irq_save(flags); - pvec = &__get_cpu_var(lru_rotate_pvecs); - if (!pagevec_add(pvec, page)) - pagevec_move_tail(pvec); - local_irq_restore(flags); - - if (!test_clear_page_writeback(page)) - BUG(); + if (!PageLocked(page) && !PageDirty(page) && !PageActive(page) && + PageLRU(page)) { + struct pagevec *pvec; + unsigned long flags; - return 0; + page_cache_get(page); + local_irq_save(flags); + pvec = &__get_cpu_var(lru_rotate_pvecs); + if (!pagevec_add(pvec, page)) + pagevec_move_tail(pvec); + local_irq_restore(flags); + } } /* _