From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast Date: Thu, 26 Jun 2014 09:53:34 +0200 Message-ID: <20140626075334.GA12054@laptop.lan> References: <1403710824-24340-1-git-send-email-steve.capper@linaro.org> <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from casper.infradead.org ([85.118.1.10]:33824 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754046AbaFZHxk (ORCPT ); Thu, 26 Jun 2014 03:53:40 -0400 Content-Disposition: inline In-Reply-To: <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Andrew Morton Cc: Steve Capper , linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, linux@arm.linux.org.uk, linux-arch@vger.kernel.org, linux-mm@kvack.org, will.deacon@arm.com, gary.robertson@linaro.org, christoffer.dall@linaro.org, anders.roxell@linaro.org On Wed, Jun 25, 2014 at 01:42:35PM -0700, Andrew Morton wrote: > On Wed, 25 Jun 2014 16:40:18 +0100 Steve Capper wrote: > > > This series implements general forms of get_user_pages_fast and > > __get_user_pages_fast and activates them for arm and arm64. > > Why not x86? > > I think I might have already asked this. If so, it's your fault for > not updating the changelog ;) Because x86 doesn't do RCU freed page tables :-) Also because i386 PAE has magic (although one might expect ARM PAE -- or whatever they called it -- to need similar magic). From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f171.google.com (mail-wi0-f171.google.com [209.85.212.171]) by kanga.kvack.org (Postfix) with ESMTP id 7CB776B0031 for ; Thu, 26 Jun 2014 03:53:41 -0400 (EDT) Received: by mail-wi0-f171.google.com with SMTP id n15so494795wiw.10 for ; Thu, 26 Jun 2014 00:53:40 -0700 (PDT) Received: from casper.infradead.org (casper.infradead.org. [2001:770:15f::2]) by mx.google.com with ESMTPS id ap2si8627268wjc.53.2014.06.26.00.53.39 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 26 Jun 2014 00:53:40 -0700 (PDT) Date: Thu, 26 Jun 2014 09:53:34 +0200 From: Peter Zijlstra Subject: Re: [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast Message-ID: <20140626075334.GA12054@laptop.lan> References: <1403710824-24340-1-git-send-email-steve.capper@linaro.org> <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Steve Capper , linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, linux@arm.linux.org.uk, linux-arch@vger.kernel.org, linux-mm@kvack.org, will.deacon@arm.com, gary.robertson@linaro.org, christoffer.dall@linaro.org, anders.roxell@linaro.org On Wed, Jun 25, 2014 at 01:42:35PM -0700, Andrew Morton wrote: > On Wed, 25 Jun 2014 16:40:18 +0100 Steve Capper wrote: > > > This series implements general forms of get_user_pages_fast and > > __get_user_pages_fast and activates them for arm and arm64. > > Why not x86? > > I think I might have already asked this. If so, it's your fault for > not updating the changelog ;) Because x86 doesn't do RCU freed page tables :-) Also because i386 PAE has magic (although one might expect ARM PAE -- or whatever they called it -- to need similar magic). -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 From: peterz@infradead.org (Peter Zijlstra) Date: Thu, 26 Jun 2014 09:53:34 +0200 Subject: [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast In-Reply-To: <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org> References: <1403710824-24340-1-git-send-email-steve.capper@linaro.org> <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org> Message-ID: <20140626075334.GA12054@laptop.lan> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, Jun 25, 2014 at 01:42:35PM -0700, Andrew Morton wrote: > On Wed, 25 Jun 2014 16:40:18 +0100 Steve Capper wrote: > > > This series implements general forms of get_user_pages_fast and > > __get_user_pages_fast and activates them for arm and arm64. > > Why not x86? > > I think I might have already asked this. If so, it's your fault for > not updating the changelog ;) Because x86 doesn't do RCU freed page tables :-) Also because i386 PAE has magic (although one might expect ARM PAE -- or whatever they called it -- to need similar magic).