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=-2.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,PDS_TONAME_EQ_TOLOCAL_SHORT,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 062A4C433DF for ; Tue, 14 Jul 2020 03:20:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BD142221E7 for ; Tue, 14 Jul 2020 03:20:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="yGgOzIP8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BD142221E7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2D6A68D0003; Mon, 13 Jul 2020 23:20:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 285268D0001; Mon, 13 Jul 2020 23:20:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1737F8D0003; Mon, 13 Jul 2020 23:20:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0095.hostedemail.com [216.40.44.95]) by kanga.kvack.org (Postfix) with ESMTP id 01BAB8D0001 for ; Mon, 13 Jul 2020 23:20:37 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 847DA2DFC for ; Tue, 14 Jul 2020 03:20:37 +0000 (UTC) X-FDA: 77035228914.09.chair67_590d98726eed Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin09.hostedemail.com (Postfix) with ESMTP id 6218E180AD815 for ; Tue, 14 Jul 2020 03:20:37 +0000 (UTC) X-HE-Tag: chair67_590d98726eed X-Filterd-Recvd-Size: 1893 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf07.hostedemail.com (Postfix) with ESMTP for ; Tue, 14 Jul 2020 03:20:36 +0000 (UTC) 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 17F5721974; Tue, 14 Jul 2020 03:20:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594696836; bh=/RtfCPLE/q3BrKJDo0IszEDqhneMNbdLBjGXhB0nAZ0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=yGgOzIP8gPvw25Te7OyITpW/Brb68JrKdxsoAOO67DKxzo0vQhLoUFxVdUqh2RPPm RKEpJZQpw8LAxPts9yYT67Gdww7rNisjg5MU7xgeQhtCzUeACXz9CFiafPjbOEsfdP JWvBS5xgepowr4fXPLnmJXDdApSUwfHU2mLjdl98= Date: Mon, 13 Jul 2020 20:20:35 -0700 From: Andrew Morton To: linmiaohe Cc: , Subject: Re: [PATCH] mm: mmap: Merge vma after call_mmap() if possible Message-Id: <20200713202035.55ea84d08a1c39423603f592@linux-foundation.org> In-Reply-To: <1594696064-1409-1-git-send-email-linmiaohe@huawei.com> References: <1594696064-1409-1-git-send-email-linmiaohe@huawei.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6218E180AD815 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 14 Jul 2020 11:07:44 +0800 linmiaohe wrote: > The vm_flags may be changed after call_mmap() because drivers may set some > flags for their own purpose. As a result, we failed to merge the adjacent > vma due to the different vm_flags as userspace can't pass in the same one. > Try to merge vma after call_mmap() to fix this issue. Which drivers do this?