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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, 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 2F9E1C433E2 for ; Fri, 11 Sep 2020 11:20:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BE51721D91 for ; Fri, 11 Sep 2020 11:20:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="MranxbqI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725768AbgIKLUN (ORCPT ); Fri, 11 Sep 2020 07:20:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51768 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725778AbgIKLTe (ORCPT ); Fri, 11 Sep 2020 07:19:34 -0400 Received: from mail-qk1-x741.google.com (mail-qk1-x741.google.com [IPv6:2607:f8b0:4864:20::741]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C37A7C061757 for ; Fri, 11 Sep 2020 04:19:33 -0700 (PDT) Received: by mail-qk1-x741.google.com with SMTP id q5so9505571qkc.2 for ; Fri, 11 Sep 2020 04:19:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=RF/fhPo5kBauAi3eDmZJgpqIrahl3Q40enwZDmyVW/Y=; b=MranxbqI0sbZTUHr/5nRrvvNnaOGVKUaAfIpgrguT3kotqu2/+vaLtFjLBr7Dchw8g JJmcJV/C0jOxv4hRKHMp+z8brOgZNv7zPlHzEFTxIGRfWe+oDWMX2pQve/8jTAvpKMiT 7RN3juzzMtOiuIWBUDCT1BvIFCKf6bxkwXrdAtvSLUiKX/5kI+sFcR6JdpWoUm6ixgyF dLqTOenPUtqGXVDIBwggt4h+6OsbKY/DS4ZW5VLOTe31mPZEk/NO9CEvKD3cWUNhjl7s kxOAXY9+GRt4ctbpbjP727YWsJahqV0QyR6AL3DhYyp7rVFeR5dvwtqaEjOc69J99Ry7 iGPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=RF/fhPo5kBauAi3eDmZJgpqIrahl3Q40enwZDmyVW/Y=; b=UnI6sIwSnJu4fAC7eJzsuyPvUfxj0mcnf1Aizyjpa5BelA8eRvPPv6cNbezwoyBlYD AQNBN2Ez2fw63oLr9GRMTkFLONzg1E8kR9qyDtbskMgh8NxpjEdweKMKwkPu7csgTWLD FROtF94Nwf+tS1bjaLX/6wlLk5YqDhTrhuAJ/qNWAnFVu7z3GC+LJOYdilqF3V1izzMv d2OsdhPi0jcaV3E2RcuoWGSjrLNJ2/SYS6KaPsL1eXXvEWN0ISbtvBl/6A39crj8Dxth 6XLiQ3K4xGePYF4KJoUO2WtsTWsFYaH0GMRtRQZ1VzoCbt1LWeNWOPW1brA0wgcRwhXe ZMzA== X-Gm-Message-State: AOAM533D81rRwD64DKJaDzoRkxF1LqmL7FDNg3weU7gJMb5ZBdwEJ6zU 48Za+FL9Y5NyxogalZGix1khXw== X-Google-Smtp-Source: ABdhPJzPJMV+cEWYRmvlb24Nbw7GCKp+KbSMxPhKphhah1G5lDmq4fX9f/inMOZg7Se/iCqj4A8+eA== X-Received: by 2002:a37:a8ca:: with SMTP id r193mr1042066qke.83.1599823172826; Fri, 11 Sep 2020 04:19:32 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-156-34-48-30.dhcp-dynamic.fibreop.ns.bellaliant.net. [156.34.48.30]) by smtp.gmail.com with ESMTPSA id k185sm2269296qkd.94.2020.09.11.04.19.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2020 04:19:31 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kGh5W-004ktM-DO; Fri, 11 Sep 2020 08:19:30 -0300 Date: Fri, 11 Sep 2020 08:19:30 -0300 From: Jason Gunthorpe To: peterz@infradead.org Cc: Linus Torvalds , Gerald Schaefer , Alexander Gordeev , Dave Hansen , John Hubbard , LKML , linux-mm , linux-arch , Andrew Morton , Russell King , Mike Rapoport , Catalin Marinas , Will Deacon , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Jeff Dike , Richard Weinberger , Dave Hansen , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Arnd Bergmann , Andrey Ryabinin , linux-x86 , linux-arm , linux-power , linux-sparc , linux-um , linux-s390 , Vasily Gorbik , Heiko Carstens , Christian Borntraeger , Claudio Imbrenda Subject: Re: [RFC PATCH v2 1/3] mm/gup: fix gup_fast with dynamic page table folding Message-ID: <20200911111930.GS87483@ziepe.ca> References: <20200909192534.442f8984@thinkpad> <20200909180324.GI87483@ziepe.ca> <20200910093925.GB29166@oc3871087118.ibm.com> <20200910181319.GO87483@ziepe.ca> <20200910211010.46d064a7@thinkpad> <20200910215921.GP87483@ziepe.ca> <20200911070939.GB1362448@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200911070939.GB1362448@hirez.programming.kicks-ass.net> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Sep 11, 2020 at 09:09:39AM +0200, peterz@infradead.org wrote: > On Thu, Sep 10, 2020 at 06:59:21PM -0300, Jason Gunthorpe wrote: > > So, I suggest pXX_offset_unlocked() > > Urgh, no. Elsewhere in gup _unlocked() means it will take the lock > itself (get_user_pages_unlocked()) -- although often it seems to mean > the lock is already held (git grep _unlocked and marvel). > > What we want is _lockless(). This is clear to me! Thanks, Jason From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Date: Fri, 11 Sep 2020 11:19:30 +0000 Subject: Re: [RFC PATCH v2 1/3] mm/gup: fix gup_fast with dynamic page table folding Message-Id: <20200911111930.GS87483@ziepe.ca> List-Id: References: <20200909192534.442f8984@thinkpad> <20200909180324.GI87483@ziepe.ca> <20200910093925.GB29166@oc3871087118.ibm.com> <20200910181319.GO87483@ziepe.ca> <20200910211010.46d064a7@thinkpad> <20200910215921.GP87483@ziepe.ca> <20200911070939.GB1362448@hirez.programming.kicks-ass.net> In-Reply-To: <20200911070939.GB1362448@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: peterz@infradead.org Cc: Linus Torvalds , Gerald Schaefer , Alexander Gordeev , Dave Hansen , John Hubbard , LKML , linux-mm , linux-arch , Andrew Morton , Russell King , Mike Rapoport , Catalin Marinas , Will Deacon , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Jeff Dike , Richard Weinberger , Dave Hansen , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Arnd Bergmann , Andrey Ryabinin , linux-x86 , linux-arm , linux-power , linux-sparc , linux-um , linux-s390 , Vasily Gorbik , Heiko Carstens , Christian Borntraeger , Claudio Imbrenda On Fri, Sep 11, 2020 at 09:09:39AM +0200, peterz@infradead.org wrote: > On Thu, Sep 10, 2020 at 06:59:21PM -0300, Jason Gunthorpe wrote: > > So, I suggest pXX_offset_unlocked() > > Urgh, no. Elsewhere in gup _unlocked() means it will take the lock > itself (get_user_pages_unlocked()) -- although often it seems to mean > the lock is already held (git grep _unlocked and marvel). > > What we want is _lockless(). This is clear to me! Thanks, Jason 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 B2EB2C433E2 for ; Fri, 11 Sep 2020 11:22:20 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 956D9221EE for ; Fri, 11 Sep 2020 11:22:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="MranxbqI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 956D9221EE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4BntdN3NfnzDqHG for ; Fri, 11 Sep 2020 21:22:16 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=ziepe.ca (client-ip=2607:f8b0:4864:20::744; helo=mail-qk1-x744.google.com; envelope-from=jgg@ziepe.ca; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=ziepe.ca header.i=@ziepe.ca header.a=rsa-sha256 header.s=google header.b=MranxbqI; dkim-atps=neutral Received: from mail-qk1-x744.google.com (mail-qk1-x744.google.com [IPv6:2607:f8b0:4864:20::744]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4BntZK1LgrzDqgC for ; Fri, 11 Sep 2020 21:19:36 +1000 (AEST) Received: by mail-qk1-x744.google.com with SMTP id d20so9493322qka.5 for ; Fri, 11 Sep 2020 04:19:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=RF/fhPo5kBauAi3eDmZJgpqIrahl3Q40enwZDmyVW/Y=; b=MranxbqI0sbZTUHr/5nRrvvNnaOGVKUaAfIpgrguT3kotqu2/+vaLtFjLBr7Dchw8g JJmcJV/C0jOxv4hRKHMp+z8brOgZNv7zPlHzEFTxIGRfWe+oDWMX2pQve/8jTAvpKMiT 7RN3juzzMtOiuIWBUDCT1BvIFCKf6bxkwXrdAtvSLUiKX/5kI+sFcR6JdpWoUm6ixgyF dLqTOenPUtqGXVDIBwggt4h+6OsbKY/DS4ZW5VLOTe31mPZEk/NO9CEvKD3cWUNhjl7s kxOAXY9+GRt4ctbpbjP727YWsJahqV0QyR6AL3DhYyp7rVFeR5dvwtqaEjOc69J99Ry7 iGPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=RF/fhPo5kBauAi3eDmZJgpqIrahl3Q40enwZDmyVW/Y=; b=q312OUAM1wujiwznRqR4aJclXrMzB3O1slE/qm0um7AawtjY/i24DvvO604hket9GB OWrbTsV7n3lUbQMfHntaKQnpomrhbUL/NP2uX41FdUNHsfZ5Rdd65JZf9dFTiGuLDREA nmIngzDrksNggMDzA1BMAFpp/Ls74gIaXJM69jvJNS89nfIal4y8cB0ZD8MOTyjdU+oT axS0UM+us6w+7cK9idNdymfphE4BLuAwFQcVuVp1XHlen13gzfLrW6Q5AenU9ohjlBxo pCJH/fS4HW6DF2hxm968XeTvNjRUR+uu6upax5/Ap6ylv78jWeCPmJXVj/qFoiHtB5mz CjBg== X-Gm-Message-State: AOAM530izAXq7uDNRF8rsikDkMfRKCg+rhepsEUP0GcV+GO9qs5nvJJn JpN1FNVjIvmIlUAv5O+/5q0uYg== X-Google-Smtp-Source: ABdhPJzPJMV+cEWYRmvlb24Nbw7GCKp+KbSMxPhKphhah1G5lDmq4fX9f/inMOZg7Se/iCqj4A8+eA== X-Received: by 2002:a37:a8ca:: with SMTP id r193mr1042066qke.83.1599823172826; Fri, 11 Sep 2020 04:19:32 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-156-34-48-30.dhcp-dynamic.fibreop.ns.bellaliant.net. [156.34.48.30]) by smtp.gmail.com with ESMTPSA id k185sm2269296qkd.94.2020.09.11.04.19.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2020 04:19:31 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kGh5W-004ktM-DO; Fri, 11 Sep 2020 08:19:30 -0300 Date: Fri, 11 Sep 2020 08:19:30 -0300 From: Jason Gunthorpe To: peterz@infradead.org Subject: Re: [RFC PATCH v2 1/3] mm/gup: fix gup_fast with dynamic page table folding Message-ID: <20200911111930.GS87483@ziepe.ca> References: <20200909192534.442f8984@thinkpad> <20200909180324.GI87483@ziepe.ca> <20200910093925.GB29166@oc3871087118.ibm.com> <20200910181319.GO87483@ziepe.ca> <20200910211010.46d064a7@thinkpad> <20200910215921.GP87483@ziepe.ca> <20200911070939.GB1362448@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200911070939.GB1362448@hirez.programming.kicks-ass.net> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , linux-mm , Paul Mackerras , linux-sparc , Alexander Gordeev , Claudio Imbrenda , Will Deacon , linux-arch , linux-s390 , Vasily Gorbik , Richard Weinberger , linux-x86 , Russell King , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Andrey Ryabinin , Gerald Schaefer , Heiko Carstens , Arnd Bergmann , John Hubbard , Jeff Dike , linux-um , Borislav Petkov , Andy Lutomirski , Thomas Gleixner , linux-arm , Dave Hansen , linux-power , LKML , Andrew Morton , Linus Torvalds , Mike Rapoport Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, Sep 11, 2020 at 09:09:39AM +0200, peterz@infradead.org wrote: > On Thu, Sep 10, 2020 at 06:59:21PM -0300, Jason Gunthorpe wrote: > > So, I suggest pXX_offset_unlocked() > > Urgh, no. Elsewhere in gup _unlocked() means it will take the lock > itself (get_user_pages_unlocked()) -- although often it seems to mean > the lock is already held (git grep _unlocked and marvel). > > What we want is _lockless(). This is clear to me! Thanks, Jason 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=-3.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, 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 40610C43461 for ; Fri, 11 Sep 2020 11:20:52 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BEBF4206E6 for ; Fri, 11 Sep 2020 11:20:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="lqLFJU1o"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="MranxbqI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BEBF4206E6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=NwHR20PhJIFgQlXVjv/cIkQtCaGUPOQCAb+Y/vLGqe8=; b=lqLFJU1omkaTS6KTgjvPILYHW nbFA9ydusg3hKZ3wbAAUS8IqFnrJ2k5Qcw4nA6reqpXNgC2pN/8gESIo+/IuqBMlW0PsDopZCqp1t KavecpAn08XpAWKFmOq4MB10LgtNA33qWgvNZGBupg+OcAG2HPoR4+MfSpJb/w1GMjNsq/VFYq1vL /I73mIKnYTdxUZ2wGw1k8RTVnaNgjIDtr1eh6R6KCQT6o5l1ceJErdFi9O3Wql30MGQU0LIeUPe3p u8aYd1G4JwjUYHc3i6HoitwE1VTKhnYnBAFXrZQ+pQ6qO32jWomLhFVPWn/emFIsEDBBf837tbr0j k0BDq2YUA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kGh5f-0002Ev-LW; Fri, 11 Sep 2020 11:19:39 +0000 Received: from mail-qk1-x741.google.com ([2607:f8b0:4864:20::741]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kGh5c-0002CY-Cv for linux-arm-kernel@lists.infradead.org; Fri, 11 Sep 2020 11:19:37 +0000 Received: by mail-qk1-x741.google.com with SMTP id w12so9476818qki.6 for ; Fri, 11 Sep 2020 04:19:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=RF/fhPo5kBauAi3eDmZJgpqIrahl3Q40enwZDmyVW/Y=; b=MranxbqI0sbZTUHr/5nRrvvNnaOGVKUaAfIpgrguT3kotqu2/+vaLtFjLBr7Dchw8g JJmcJV/C0jOxv4hRKHMp+z8brOgZNv7zPlHzEFTxIGRfWe+oDWMX2pQve/8jTAvpKMiT 7RN3juzzMtOiuIWBUDCT1BvIFCKf6bxkwXrdAtvSLUiKX/5kI+sFcR6JdpWoUm6ixgyF dLqTOenPUtqGXVDIBwggt4h+6OsbKY/DS4ZW5VLOTe31mPZEk/NO9CEvKD3cWUNhjl7s kxOAXY9+GRt4ctbpbjP727YWsJahqV0QyR6AL3DhYyp7rVFeR5dvwtqaEjOc69J99Ry7 iGPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=RF/fhPo5kBauAi3eDmZJgpqIrahl3Q40enwZDmyVW/Y=; b=npN9bOhlGeuSHlELSF2GyjUEk5gNTmY0GrMOvK5TobN4rtfHM3ERuhDroy9p9gA1qI ac5DP4spAxMF9uxjCdtqqiexAnUOReMk5HkznXYIN5lUt7MUuNbZ7tXuQK1xZdsr2aL6 sCDD9qzDhQrgn2iCJm5Lb5lorHsTcsbXeiC6FocOLKSeJvrbcwvu45r5/YQtYeoBacBw vn3lerX3wFoJhvSINGEglElaQoct5ZnfmmEyOHmxyXzv9nA3jQyBSvfm7MpJLzW8hyHl b60iMuKzP5J4aO4nWb8cVpoH/SH0djmShcEXrKLdPO7bCXjs+CzeYP5F6W0A3wTjWO4m NvNg== X-Gm-Message-State: AOAM531RandIrTYuTUgV5udMbiUt6PxEV8YUz9Y2d5XLyrWIK8OK5b9D xEliXhyt4DKIfSuYDPrn33w7Bw== X-Google-Smtp-Source: ABdhPJzPJMV+cEWYRmvlb24Nbw7GCKp+KbSMxPhKphhah1G5lDmq4fX9f/inMOZg7Se/iCqj4A8+eA== X-Received: by 2002:a37:a8ca:: with SMTP id r193mr1042066qke.83.1599823172826; Fri, 11 Sep 2020 04:19:32 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-156-34-48-30.dhcp-dynamic.fibreop.ns.bellaliant.net. [156.34.48.30]) by smtp.gmail.com with ESMTPSA id k185sm2269296qkd.94.2020.09.11.04.19.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2020 04:19:31 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kGh5W-004ktM-DO; Fri, 11 Sep 2020 08:19:30 -0300 Date: Fri, 11 Sep 2020 08:19:30 -0300 From: Jason Gunthorpe To: peterz@infradead.org Subject: Re: [RFC PATCH v2 1/3] mm/gup: fix gup_fast with dynamic page table folding Message-ID: <20200911111930.GS87483@ziepe.ca> References: <20200909192534.442f8984@thinkpad> <20200909180324.GI87483@ziepe.ca> <20200910093925.GB29166@oc3871087118.ibm.com> <20200910181319.GO87483@ziepe.ca> <20200910211010.46d064a7@thinkpad> <20200910215921.GP87483@ziepe.ca> <20200911070939.GB1362448@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200911070939.GB1362448@hirez.programming.kicks-ass.net> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200911_071936_442249_989CCE84 X-CRM114-Status: GOOD ( 15.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Benjamin Herrenschmidt , Dave Hansen , linux-mm , Paul Mackerras , linux-sparc , Alexander Gordeev , Claudio Imbrenda , Will Deacon , linux-arch , linux-s390 , Vasily Gorbik , Richard Weinberger , linux-x86 , Russell King , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Andrey Ryabinin , Gerald Schaefer , Heiko Carstens , Arnd Bergmann , John Hubbard , Jeff Dike , linux-um , Borislav Petkov , Andy Lutomirski , Thomas Gleixner , linux-arm , Dave Hansen , linux-power , LKML , Michael Ellerman , Andrew Morton , Linus Torvalds , Mike Rapoport Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Sep 11, 2020 at 09:09:39AM +0200, peterz@infradead.org wrote: > On Thu, Sep 10, 2020 at 06:59:21PM -0300, Jason Gunthorpe wrote: > > So, I suggest pXX_offset_unlocked() > > Urgh, no. Elsewhere in gup _unlocked() means it will take the lock > itself (get_user_pages_unlocked()) -- although often it seems to mean > the lock is already held (git grep _unlocked and marvel). > > What we want is _lockless(). This is clear to me! Thanks, Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk1-x742.google.com ([2607:f8b0:4864:20::742]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kGh5a-0002CX-Qr for linux-um@lists.infradead.org; Fri, 11 Sep 2020 11:19:36 +0000 Received: by mail-qk1-x742.google.com with SMTP id o5so9450214qke.12 for ; Fri, 11 Sep 2020 04:19:34 -0700 (PDT) Date: Fri, 11 Sep 2020 08:19:30 -0300 From: Jason Gunthorpe Subject: Re: [RFC PATCH v2 1/3] mm/gup: fix gup_fast with dynamic page table folding Message-ID: <20200911111930.GS87483@ziepe.ca> References: <20200909192534.442f8984@thinkpad> <20200909180324.GI87483@ziepe.ca> <20200910093925.GB29166@oc3871087118.ibm.com> <20200910181319.GO87483@ziepe.ca> <20200910211010.46d064a7@thinkpad> <20200910215921.GP87483@ziepe.ca> <20200911070939.GB1362448@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200911070939.GB1362448@hirez.programming.kicks-ass.net> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org To: peterz@infradead.org Cc: Benjamin Herrenschmidt , Dave Hansen , linux-mm , Paul Mackerras , linux-sparc , Alexander Gordeev , Claudio Imbrenda , Will Deacon , linux-arch , linux-s390 , Vasily Gorbik , Richard Weinberger , linux-x86 , Russell King , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Andrey Ryabinin , Gerald Schaefer , Heiko Carstens , Arnd Bergmann , John Hubbard , Jeff Dike , linux-um , Borislav Petkov , Andy Lutomirski , Thomas Gleixner , linux-arm , Dave Hansen , linux-power , LKML , Michael Ellerman , Andrew Morton , Linus Torvalds , Mike Rapoport On Fri, Sep 11, 2020 at 09:09:39AM +0200, peterz@infradead.org wrote: > On Thu, Sep 10, 2020 at 06:59:21PM -0300, Jason Gunthorpe wrote: > > So, I suggest pXX_offset_unlocked() > > Urgh, no. Elsewhere in gup _unlocked() means it will take the lock > itself (get_user_pages_unlocked()) -- although often it seems to mean > the lock is already held (git grep _unlocked and marvel). > > What we want is _lockless(). This is clear to me! Thanks, Jason _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um