From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Landley Subject: Re: [patch] ext2: xip check fix Date: Thu, 6 Dec 2007 22:17:39 -0600 Message-ID: <200712062217.40355.rob@landley.net> References: <20071204042628.GA26636@wotan.suse.de> <200712061211.49443.rob@landley.net> <6934efce0712061922j682cee55pc1d5d079465f4849@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: carsteno@de.ibm.com, "Nick Piggin" , "Christian Borntraeger" , "Linux Kernel Mailing List" , linux-fsdevel@vger.kernel.org, "Eric W. Biederman" , "Andrew Morton" , "Jens Axboe" To: "Jared Hulbert" Return-path: Received: from static-71-162-243-5.phlapa.fios.verizon.net ([71.162.243.5]:45524 "EHLO grelber.thyrsus.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752772AbXLGERr (ORCPT ); Thu, 6 Dec 2007 23:17:47 -0500 In-Reply-To: <6934efce0712061922j682cee55pc1d5d079465f4849@mail.gmail.com> Content-Disposition: inline Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Thursday 06 December 2007 21:22:25 Jared Hulbert wrote: > > > I have'nt looked at it yet. I do appreciate it, I think it might > > > broaden the user-base of this feature which is up to now s390 only due > > > to the fact that the flash memory extensions have not been implemented > > > (yet?). And it enables testing xip on other platforms. The patch is on > > > my must-read list. > > > > query: which feature is currently s390 only? (Execute In Place?) > > I think so. The filemap_xip.c functionality doesn't work for Flash > memory yet. Flash memory doesn't have struct pages to back it up with > which this stuff depends on. Um, trying to clarify: S390. Also known as zSeries, big iron machine, uses its own weird processor design rather than x86, x86-64, arm, or mips processors. How does "struct page" enter into this? What I want to know is, are you saying execute in place doesn't work on things like arm and mips? (I so, I was unaware of this. I heard about somebody getting it to work on a Nintendo DS: http://forums.maxconsole.net/showthread.php?t=18668 ) Rob -- "One of my most productive days was throwing away 1000 lines of code." - Ken Thompson.