From mboxrd@z Thu Jan 1 00:00:00 1970 From: Larry Bassel Subject: Re: how can I cleanly exclude memory from the kernel memory allocator? Date: Tue, 19 Apr 2011 16:33:36 -0700 Message-ID: <20110419233336.GF29359@labbmf-linux.qualcomm.com> References: <20110324221854.GA29359@labbmf-linux.qualcomm.com> <20110325173928.GD29359@labbmf-linux.qualcomm.com> <20110325202755.GA13574@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from wolverine02.qualcomm.com ([199.106.114.251]:42704 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752505Ab1DSXdj (ORCPT ); Tue, 19 Apr 2011 19:33:39 -0400 Content-Disposition: inline In-Reply-To: <20110325202755.GA13574@n2100.arm.linux.org.uk> Sender: linux-arm-msm-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org To: linux-arm-kernel@lists.infradead.org Cc: linux-arm-msm@vger.kernel.org, Russell King - ARM Linux , Nicolas Pitre On 25 Mar 11 20:27, Russell King - ARM Linux wrote: > On Fri, Mar 25, 2011 at 10:39:28AM -0700, Larry Bassel wrote: > > OK, please ignore my previous mail, I see that .fixup can be > > used to adjust tags. It appears to me, however, that using a > > .reserve function calling memblock_reserve will be an > > easier way of doing what I need. > > Absolutely. Hopefully I'm just missing something obvious, but when I call memblock_reserve (in .38) to reserve a block of memory away from the general kernel memory pool, I find that an ioremap of memory within the reserved block still fails because pte_valid() is apparently true. Is this intended behavior? If so, what would the correct way of separating memory from the system be so that there is no longer a 1-to-1 1M mapping for this memory and ioremap (creating the *only* mapping for this memory) is allowed? Thanks. Larry > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. From mboxrd@z Thu Jan 1 00:00:00 1970 From: lbassel@codeaurora.org (Larry Bassel) Date: Tue, 19 Apr 2011 16:33:36 -0700 Subject: how can I cleanly exclude memory from the kernel memory allocator? In-Reply-To: <20110325202755.GA13574@n2100.arm.linux.org.uk> References: <20110324221854.GA29359@labbmf-linux.qualcomm.com> <20110325173928.GD29359@labbmf-linux.qualcomm.com> <20110325202755.GA13574@n2100.arm.linux.org.uk> Message-ID: <20110419233336.GF29359@labbmf-linux.qualcomm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 25 Mar 11 20:27, Russell King - ARM Linux wrote: > On Fri, Mar 25, 2011 at 10:39:28AM -0700, Larry Bassel wrote: > > OK, please ignore my previous mail, I see that .fixup can be > > used to adjust tags. It appears to me, however, that using a > > .reserve function calling memblock_reserve will be an > > easier way of doing what I need. > > Absolutely. Hopefully I'm just missing something obvious, but when I call memblock_reserve (in .38) to reserve a block of memory away from the general kernel memory pool, I find that an ioremap of memory within the reserved block still fails because pte_valid() is apparently true. Is this intended behavior? If so, what would the correct way of separating memory from the system be so that there is no longer a 1-to-1 1M mapping for this memory and ioremap (creating the *only* mapping for this memory) is allowed? Thanks. Larry > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.