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x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfH37OqDytkgID2SlMiwFGpW9iFjwfkNxXlgAiXl9N9qjxEH2TKPUzAIBGQTCiNmh8+k1zc0Qc1WIhJDPLSjJF9ENHR/AWD3uPhvpVFQyhJIaaRCLokZ8 g/o5lQU9W0Da0uwQZoQw51vRcLuC2iC144ze25EnWFYACfkwjcWdeFKvvgJ03/djRxpIQtfRN9Aj8y77i5nUXmwsqu8Fi4jehX6wNOYg0OiOEldz0vauHJU2 X-CM-Analysis: v=2.3 cv=NPP7BXyg c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=kj9zAlcOel0A:10 a=Kd1tUaAdevIA:10 a=h116-fA8RKNBJDk72LQA:9 a=CjuIK1q_8ugA:10 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759646AbeD1JCY (ORCPT ); Sat, 28 Apr 2018 05:02:24 -0400 Received: from 8bytes.org ([81.169.241.247]:50440 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759592AbeD1JCW (ORCPT ); Sat, 28 Apr 2018 05:02:22 -0400 Date: Sat, 28 Apr 2018 11:02:17 +0200 From: "joro@8bytes.org" To: "Kani, Toshi" Cc: "linux-kernel@vger.kernel.org" , "bp@suse.de" , "tglx@linutronix.de" , "linux-mm@kvack.org" , "guohanjun@huawei.com" , "wxf.wang@hisilicon.com" , "stable@vger.kernel.org" , "x86@kernel.org" , "akpm@linux-foundation.org" , "willy@infradead.org" , "hpa@zytor.com" , "catalin.marinas@arm.com" , "mingo@redhat.com" , "will.deacon@arm.com" , "Hocko, Michal" , "cpandya@codeaurora.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v2 2/2] x86/mm: implement free pmd/pte page interfaces Message-ID: <20180428090217.n2l3w4vobmtkvz6k@8bytes.org> References: <20180314180155.19492-1-toshi.kani@hpe.com> <20180314180155.19492-3-toshi.kani@hpe.com> <20180426141926.GN15462@8bytes.org> <1524759629.2693.465.camel@hpe.com> <20180426172327.GQ15462@8bytes.org> <1524764948.2693.478.camel@hpe.com> <20180426200737.GS15462@8bytes.org> <1524781764.2693.503.camel@hpe.com> <20180427073719.GT15462@8bytes.org> <1524839460.2693.531.camel@hpe.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1524839460.2693.531.camel@hpe.com> User-Agent: NeoMutt/20170421 (1.8.2) Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Fri, Apr 27, 2018 at 02:31:51PM +0000, Kani, Toshi wrote: > So, we can add the step 2 on top of this patch. > 1. Clear pud/pmd entry. > 2. System wide TLB flush <-- TO BE ADDED BY NEW PATCH > 3. Free its underlining pmd/pte page. This still lacks the page-table synchronization and will thus not fix the BUG_ON being triggered. > We do not need to revert this patch. We can make the above change I > mentioned. Please note that we are not in the merge window anymore and that any fix needs to be simple and obviously correct. Thanks, Joerg