From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755449Ab1GOJGC (ORCPT ); Fri, 15 Jul 2011 05:06:02 -0400 Received: from gate.crashing.org ([63.228.1.57]:57974 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752273Ab1GOJGA (ORCPT ); Fri, 15 Jul 2011 05:06:00 -0400 Subject: Re: [PATCH 0/1] Fixup write permission of TLB on powerpc e500 core From: Benjamin Herrenschmidt To: Peter Zijlstra Cc: Shan Hai , paulus@samba.org, tglx@linutronix.de, walken@google.com, dhowells@redhat.com, cmetcalf@tilera.com, tony.luck@intel.com, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org In-Reply-To: <1310718056.2586.275.camel@twins> References: <1310717238-13857-1-git-send-email-haishan.bai@gmail.com> <1310718056.2586.275.camel@twins> Content-Type: text/plain; charset="UTF-8" Date: Fri, 15 Jul 2011 19:05:23 +1000 Message-ID: <1310720723.4968.309.camel@pasglop> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2011-07-15 at 10:20 +0200, Peter Zijlstra wrote: > But but but but, that get_user_pages(.write=1, .force=0) should result > in a COW break, getting our own writable page. > > What is this e500 thing smoking that this doesn't work? Right. That should have triggered the cow & flushed the TLB entry.... Cheers, Ben. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 8C783B6EE8 for ; Fri, 15 Jul 2011 19:05:53 +1000 (EST) Subject: Re: [PATCH 0/1] Fixup write permission of TLB on powerpc e500 core From: Benjamin Herrenschmidt To: Peter Zijlstra In-Reply-To: <1310718056.2586.275.camel@twins> References: <1310717238-13857-1-git-send-email-haishan.bai@gmail.com> <1310718056.2586.275.camel@twins> Content-Type: text/plain; charset="UTF-8" Date: Fri, 15 Jul 2011 19:05:23 +1000 Message-ID: <1310720723.4968.309.camel@pasglop> Mime-Version: 1.0 Cc: tony.luck@intel.com, Shan Hai , linux-kernel@vger.kernel.org, cmetcalf@tilera.com, dhowells@redhat.com, paulus@samba.org, tglx@linutronix.de, walken@google.com, linuxppc-dev@lists.ozlabs.org, akpm@linux-foundation.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Fri, 2011-07-15 at 10:20 +0200, Peter Zijlstra wrote: > But but but but, that get_user_pages(.write=1, .force=0) should result > in a COW break, getting our own writable page. > > What is this e500 thing smoking that this doesn't work? Right. That should have triggered the cow & flushed the TLB entry.... Cheers, Ben.