From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Subject: Re: [PATCH 1/5] resources: add arch hook for preventing allocation in reserved areas Date: Fri, 10 Dec 2010 12:30:08 -0800 Message-ID: <20101210123008.7fed582d@jbarnes-desktop> References: <20101208213606.13026.47657.stgit@bob.kio> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20101208213606.13026.47657.stgit@bob.kio> Sender: linux-pci-owner@vger.kernel.org To: Bjorn Helgaas Cc: Len Brown , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, "H. Peter Anvin" , Thomas Gleixner , Linus Torvalds , Ingo Molnar , Adam Belay List-Id: linux-acpi@vger.kernel.org On Wed, 08 Dec 2010 14:36:06 -0700 Bjorn Helgaas wrote: > > This adds arch_remove_reservations(), which an arch can implement if it > needs to protect part of the address space from allocation. > > Sometimes that can be done by just requesting a resource. This hook is to > cover cases where protected area doesn't fit well in the hierarchical > resource tree. For example, x86 BIOS E820 reservations are not related > to devices, so they may overlap part of, all of, or more than a device > resource. > > Signed-off-by: Bjorn Helgaas > --- Hm, this is bigger than the simple change of just avoiding the high 2M; Linus have you checked it out yet? It's nicer than simply adjusting PCIBIOS_MAX_MEM since it will affect all resource callers rather than just PCI, but it's definitely bigger. If you want just the simple change for 2.6.37 I can push that, but we'll need to get a tested-by from Matthew: diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h index ca0437c..aef9f77 100644 --- a/arch/x86/include/asm/pci.h +++ b/arch/x86/include/asm/pci.h @@ -141,7 +141,7 @@ void dma32_reserve_bootmem(void); /* generic pci stuff */ #include -#define PCIBIOS_MAX_MEM_32 0xffffffff +#define PCIBIOS_MAX_MEM_32 0xfff00000 #ifdef CONFIG_NUMA /* Returns the node based on pci bus */ and I'll queue up this set for 2.6.38. Thanks, -- Jesse Barnes, Intel Open Source Technology Center