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    Subject[PATCH for review] [23/48] x86_64: disable srat when numa emulation succeeds
    Date

    From: David Rientjes <rientjes@google.com>

    When NUMA emulation succeeds, acpi_numa needs to be set to -1 so that
    srat_disabled() will always return true. We won't be calling
    acpi_scan_nodes() or registering the true nodes we've found.

    [hugh@veritas.com: Fix x86_64 CONFIG_NUMA_EMU build: acpi_numa needs CONFIG_ACPI_NUMA]
    Cc: Andi Kleen <ak@suse.de>
    Signed-off-by: David Rientjes <rientjes@google.com>
    Signed-off-by: Andi Kleen <ak@suse.de>
    Cc: Len Brown <lenb@kernel.org>
    Signed-off-by: Hugh Dickins <hugh@veritas.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    ---

    arch/x86_64/mm/numa.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    Index: linux/arch/x86_64/mm/numa.c
    ===================================================================
    --- linux.orig/arch/x86_64/mm/numa.c
    +++ linux/arch/x86_64/mm/numa.c
    @@ -473,9 +473,13 @@ out:

    /*
    * We need to vacate all active ranges that may have been registered by
    - * SRAT.
    + * SRAT and set acpi_numa to -1 so that srat_disabled() always returns
    + * true. NUMA emulation has succeeded so we will not scan ACPI nodes.
    */
    remove_all_active_ranges();
    +#ifdef CONFIG_ACPI_NUMA
    + acpi_numa = -1;
    +#endif
    for_each_node_mask(i, node_possible_map) {
    e820_register_active_regions(i, nodes[i].start >> PAGE_SHIFT,
    nodes[i].end >> PAGE_SHIFT);
    -
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