From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f50.google.com (mail-pa0-f50.google.com [209.85.220.50]) by kanga.kvack.org (Postfix) with ESMTP id 5C13D6B008C for ; Wed, 10 Sep 2014 16:22:51 -0400 (EDT) Received: by mail-pa0-f50.google.com with SMTP id bj1so6448112pad.9 for ; Wed, 10 Sep 2014 13:22:51 -0700 (PDT) Received: from g2t2354.austin.hp.com (g2t2354.austin.hp.com. [15.217.128.53]) by mx.google.com with ESMTPS id hn2si29284006pbc.82.2014.09.10.13.22.49 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 10 Sep 2014 13:22:50 -0700 (PDT) Message-ID: <1410379933.28990.287.camel@misato.fc.hp.com> Subject: Re: [PATCH v2 6/6] x86, pat: Update documentation for WT changes From: Toshi Kani Date: Wed, 10 Sep 2014 14:12:13 -0600 In-Reply-To: References: <1410367910-6026-1-git-send-email-toshi.kani@hp.com> <1410367910-6026-7-git-send-email-toshi.kani@hp.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andy Lutomirski Cc: "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , Andrew Morton , Arnd Bergmann , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Juergen Gross , Stefan Bader , Henrique de Moraes Holschuh , Yigal Korman , Konrad Rzeszutek Wilk On Wed, 2014-09-10 at 11:30 -0700, Andy Lutomirski wrote: > On Wed, Sep 10, 2014 at 9:51 AM, Toshi Kani wrote: > > +Drivers may map the entire NV-DIMM range with ioremap_cache and then change > > +a specific range to wt with set_memory_wt. > > That's mighty specific :) How about below? Drivers may use set_memory_wt to set WT type for cached reserve ranges. > It's also not all that informative. Are you supposed to set the > memory back before iounmapping? Setting back to WB before iounmap is not required, but set_memory_wb is used when it wants to put it back to WB before unmapping. > Can you do this with set_memory_wc on > an uncached mapping? The table lists interfaces and their intended usage. Using set_memory_wc on an uncached mapping probably works, but is not an intended use. Thanks, -Toshi -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org