Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932123AbVLCS03 (ORCPT ); Sat, 3 Dec 2005 13:26:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932124AbVLCS02 (ORCPT ); Sat, 3 Dec 2005 13:26:28 -0500 Received: from ms-smtp-03.nyroc.rr.com ([24.24.2.57]:38554 "EHLO ms-smtp-03.nyroc.rr.com") by vger.kernel.org with ESMTP id S932123AbVLCS02 (ORCPT ); Sat, 3 Dec 2005 13:26:28 -0500 Subject: Re: copy_from_user/copy_to_user question From: Steven Rostedt To: Andi Kleen Cc: Vinay Venkataraghavan , linux-kernel In-Reply-To: References: <5fv0G-3kS-11@gated-at.bofh.it> <5fvam-3vP-9@gated-at.bofh.it> <43910731.4090404@shaw.ca> <1133580225.4894.29.camel@localhost.localdomain> Content-Type: text/plain Date: Sat, 03 Dec 2005 13:26:18 -0500 Message-Id: <1133634378.6724.16.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 973 Lines: 23 On Sat, 2005-12-03 at 15:35 -0700, Andi Kleen wrote: > Steven Rostedt writes: > > > > Nope, the kernel is always locked into memory. If you take a page fault > > from the kernel world, you will crash and burn. The kernel is never > > "swapped out". So if you are in kernel mode, going into do_page_fault > > in arch/i386/mm/fault.c there is no path to swap a page in. > > Actually there is - when the page fault was caused by *_user. Sorry I wasn't clearer. I know the copy_user case (and explained it in detail earlier in this thread). I was talking about what happens in the memcpy case. So that should have said "outside of copy_user and friends, there is no path to swap a page in". -- Steve - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/