From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E6BAC433DF for ; Fri, 16 Oct 2020 02:42:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3094720897 for ; Fri, 16 Oct 2020 02:42:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602816155; bh=1UzBdhHCB+IHIQVeS+1osjWoD7zVb24gmfJfTNS6YkM=; h=Date:From:To:Subject:In-Reply-To:Reply-To:List-ID:From; b=O33WLv2XJuT+enO9+ZHyGIEUsPAwM4FvYFxEW62Cl/jbrT6jBoutAbz778i81tCux 3rWuHGB3X86Bj9Rhi4f0VvhsNPaRcNCYKY73TE9f7Z7DAUiAWYOqRfOzXTFwI7j37I Dbs4Fuhv4T1Rb3xZNv6CbV7eHU6I9iv5k+AdRRUM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393813AbgJPCme (ORCPT ); Thu, 15 Oct 2020 22:42:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:58052 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728688AbgJPCme (ORCPT ); Thu, 15 Oct 2020 22:42:34 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C3B432087D; Fri, 16 Oct 2020 02:42:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602816154; bh=1UzBdhHCB+IHIQVeS+1osjWoD7zVb24gmfJfTNS6YkM=; h=Date:From:To:Subject:In-Reply-To:From; b=b2q7mn6Nac21Q5kRUnX/QByCrtpCPCdLWi0nG77umFD+BILnrf3o3q6+IeHETMHtI J2Uk5Tlm2Asdd6O2JtsNd0kYy/EZgAoFLQzqUQJedqQJxmiajxgmkMIt/495xsjvOz z+i51d/ec+IpxjbH5QGaly+IZ9VKusjg20N0qegU= Date: Thu, 15 Oct 2020 19:42:33 -0700 From: Andrew Morton To: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, sjpark@amazon.de, torvalds@linux-foundation.org, willy@infradead.org, ying.huang@intel.com Subject: [patch 028/156] mm/page-writeback: support tail pages in wait_for_stable_page Message-ID: <20201016024233.afi-U5P5P%akpm@linux-foundation.org> In-Reply-To: <20201015192732.f448da14e9854c7cb7299956@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: "Matthew Wilcox (Oracle)" Subject: mm/page-writeback: support tail pages in wait_for_stable_page page->mapping is undefined for tail pages, so operate exclusively on the head page. Link: https://lkml.kernel.org/r/20200908195539.25896-11-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Kirill A. Shutemov Reviewed-by: SeongJae Park Cc: Huang Ying Signed-off-by: Andrew Morton --- mm/page-writeback.c | 1 + 1 file changed, 1 insertion(+) --- a/mm/page-writeback.c~mm-page-writeback-support-tail-pages-in-wait_for_stable_page +++ a/mm/page-writeback.c @@ -2849,6 +2849,7 @@ EXPORT_SYMBOL_GPL(wait_on_page_writeback */ void wait_for_stable_page(struct page *page) { + page = thp_head(page); if (page->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES) wait_on_page_writeback(page); } _