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Date: Wed, 21 Feb 2007 05:49:56 +0100 (CET) From: Nick Piggin <npiggin@...e.de> To: Linux Memory Management <linux-mm@...ck.org>, Andrew Morton <akpm@...l.org> Cc: Linux Kernel <linux-kernel@...r.kernel.org>, Nick Piggin <npiggin@...e.de>, Benjamin Herrenschmidt <benh@...nel.crashing.org> Subject: [patch 2/6] mm: simplify filemap_nopage Identical block is duplicated twice: contrary to the comment, we have been re-reading the page *twice* in filemap_nopage rather than once. If any retry logic or anything is needed, it belongs in lower levels anyway. Only retry once. Linus agrees. Signed-off-by: Nick Piggin <npiggin@...e.de> mm/filemap.c | 24 ------------------------ 1 file changed, 24 deletions(-) Index: linux-2.6/mm/filemap.c =================================================================== --- linux-2.6.orig/mm/filemap.c +++ linux-2.6/mm/filemap.c @@ -1448,30 +1448,6 @@ page_not_uptodate: majmin = VM_FAULT_MAJOR; count_vm_event(PGMAJFAULT); } - lock_page(page); - - /* Did it get unhashed while we waited for it? */ - if (!page->mapping) { - unlock_page(page); - page_cache_release(page); - goto retry_all; - } - - /* Did somebody else get it up-to-date? */ - if (PageUptodate(page)) { - unlock_page(page); - goto success; - } - - error = mapping->a_ops->readpage(file, page); - if (!error) { - wait_on_page_locked(page); - if (PageUptodate(page)) - goto success; - } else if (error == AOP_TRUNCATED_PAGE) { - page_cache_release(page); - goto retry_find; - } /* * Umm, take care of errors if the page isn't up-to-date. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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