From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755518Ab1JWMAV (ORCPT ); Sun, 23 Oct 2011 08:00:21 -0400 Received: from caramon.arm.linux.org.uk ([78.32.30.218]:45340 "EHLO caramon.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755398Ab1JWMAT (ORCPT ); Sun, 23 Oct 2011 08:00:19 -0400 Date: Sun, 23 Oct 2011 13:00:08 +0100 From: Russell King - ARM Linux To: Catalin Marinas Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v7 16/16] ARM: LPAE: Add the Kconfig entries Message-ID: <20111023120008.GE17912@n2100.arm.linux.org.uk> References: <1312988619-16804-1-git-send-email-catalin.marinas@arm.com> <1312988619-16804-17-git-send-email-catalin.marinas@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1312988619-16804-17-git-send-email-catalin.marinas@arm.com> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 10, 2011 at 04:03:39PM +0100, Catalin Marinas wrote: > diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig > index 88633fe..2df5504 100644 > --- a/arch/arm/mm/Kconfig > +++ b/arch/arm/mm/Kconfig > @@ -629,6 +629,19 @@ config IO_36 > > comment "Processor Features" > > +config ARM_LPAE > + bool "Support for the Large Physical Address Extension" > + depends on MMU && CPU_V7 > + help > + Say Y if you have an ARMv7 processor supporting the LPAE page table > + format and you would like to access memory beyond the 4GB limit. This help text is entirely insufficient. It doesn't tell people what the implications are for enabling this option on CPUs without LPAE support. (It won't boot.) It doesn't suggest what people should select when they're unsure what setting to use.