Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763057AbZAQXOS (ORCPT ); Sat, 17 Jan 2009 18:14:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762196AbZAQXNl (ORCPT ); Sat, 17 Jan 2009 18:13:41 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:39293 "EHLO gprs189-60.eurotel.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760294AbZAQXNl (ORCPT ); Sat, 17 Jan 2009 18:13:41 -0500 Date: Sat, 17 Jan 2009 18:42:25 +0100 From: Pavel Machek To: Suresh Siddha Cc: "H. Peter Anvin" , "mingo@elte.hu" , "tglx@linutronix.de" , "Pallipadi, Venkatesh" , "linux-kernel@vger.kernel.org" , "tvignaud@mandriva.com" Subject: Re: [patch] x86, pat: fix reserve_memtype() for legacy 1MB range Message-ID: <20090117174224.GA1409@ucw.cz> References: <20090109223520.GC6472@linux-os.sc.intel.com> <4967D223.1090703@zytor.com> <20090109224804.GD6472@linux-os.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090109224804.GD6472@linux-os.sc.intel.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1174 Lines: 28 On Fri 2009-01-09 14:48:04, Suresh Siddha wrote: > On Fri, Jan 09, 2009 at 02:39:31PM -0800, H. Peter Anvin wrote: > > Suresh Siddha wrote: > > > > > > Here X is trying to map first 8KB of memory using /dev/mem. Existing > > > code treats first 0-4KB of memory as non-RAM and 4KB-8KB as RAM. Recent > > > code changes don't allow to map memory with different attributes > > > at the same time. > > > > > > > Why was 0-4 KB marked as non-RAM? It is most definitely RAM, and should > > be WB. > > While in reality it is RAM, we have CONFIG_STRICT_DEVMEM which doesn't allow > apps to map RAM pages using /dev/mem. And to allow app's to map the > legacy 0-4KB bios data page, we consider it as non-RAM. Fix config_strict_devmem? Ram is ram, and we should not li for strict_devmem benefit... -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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/