From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Torvalds Subject: Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction Date: Wed, 18 Jun 2008 17:24:30 -0700 (PDT) Message-ID: References: <1213831403.8011.24.camel@pasglop> <4859A149.9090004@goop.org> <4859A528.1010107@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4859A528.1010107@goop.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Jeremy Fitzhardinge Cc: xen-devel , Peter Zijlstra , kvm-devel , benh@kernel.crashing.org, x86@kernel.org, LKML , Virtualization Mailing List , Hugh Dickins , Ingo Molnar , Thomas Gleixner List-Id: virtualization@lists.linuxfoundation.org On Wed, 18 Jun 2008, Jeremy Fitzhardinge wrote: > > Along the lines of: Hell no. There's a reason we have a special set_wrprotect() thing. We can do it more efficiently on native hardware by just clearing the bit atomically. No need to do the cmpxchg games. Linus