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    Subject[PATCH v5 9/9] x86: allocate space within a region top-down
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    Request that allocate_resource() use available space from high addresses
    first, rather than the default of using low addresses first.

    The most common place this makes a difference is when we move or assign
    new PCI device resources. Low addresses are generally scarce, so it's
    better to use high addresses when possible. This follows Windows practice
    for PCI allocation.

    Reference: https://bugzilla.kernel.org/show_bug.cgi?id=16228#c42
    Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
    ---

    arch/x86/kernel/setup.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)


    diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
    index 85268f8..21c6746 100644
    --- a/arch/x86/kernel/setup.c
    +++ b/arch/x86/kernel/setup.c
    @@ -769,6 +769,7 @@ void __init setup_arch(char **cmdline_p)

    x86_init.oem.arch_setup();

    + resource_alloc_from_bottom = 0;
    iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
    setup_memory_map();
    parse_setup_data();


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