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    SubjectRe: [PATCH 1/5] resources: add arch hook for preventing allocation in reserved areas
    [Actually cc'ing Matthew this time]

    On Fri, 10 Dec 2010 12:30:08 -0800
    Jesse Barnes <jbarnes@virtuousgeek.org> wrote:

    > On Wed, 08 Dec 2010 14:36:06 -0700
    > Bjorn Helgaas <bjorn.helgaas@hp.com> 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 <bjorn.helgaas@hp.com>
    > > ---
    >
    > 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 <asm-generic/pci.h>
    > -#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


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