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    SubjectRe: [PATCH 0/2] Relax restrictions on setting CONFIG_NUMA on x86

    * Mel Gorman <mel@csn.ul.ie> wrote:

    > > I think this patch become easy to the porting of fakenuma.
    >
    > It would be great if that was available, particularly if it could fake
    > memoryless nodes as that is a place where we've found a few
    > difficult-to-reproduce bugs.

    yeah. Your previous patch (see below) had build problems - are those
    resolved meanwhile?

    Ingo

    ----------->
    Subject: x86: allow any x86 sub-architecture type to set CONFIG_NUMA
    From: Mel Gorman <mel@csn.ul.ie>

    While there are a limited number of x86 sub-architecture types that can
    really support NUMA, there is nothing stopping other machines booting that
    type of kernel. The fact that X86_GENERICARCH can set NUMA currently is an
    indicator of that. This restriction only limits potential testing coverage.
    This patch allows any sub-architecture to set CONFIG_NUMA if they wish.

    Signed-off-by: Mel Gorman <mel@csn.ul.ie>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    ---

    arch/x86/Kconfig | 2 +-
    include/asm-x86/acpi.h | 1 +
    include/linux/acpi.h | 1 -
    3 files changed, 2 insertions(+), 2 deletions(-)

    Index: linux-x86.q/arch/x86/Kconfig
    ===================================================================
    --- linux-x86.q.orig/arch/x86/Kconfig
    +++ linux-x86.q/arch/x86/Kconfig
    @@ -816,7 +816,7 @@ config X86_PAE
    config NUMA
    bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
    depends on SMP
    - depends on X86_64 || (X86_32 && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
    + depends on X86_64 || (X86_32 && ACPI && EXPERIMENTAL)
    default n if X86_PC
    default y if (X86_NUMAQ || X86_SUMMIT)
    help
    Index: linux-x86.q/include/asm-x86/acpi.h
    ===================================================================
    --- linux-x86.q.orig/include/asm-x86/acpi.h
    +++ linux-x86.q/include/asm-x86/acpi.h
    @@ -79,6 +79,7 @@ int __acpi_release_global_lock(unsigned
    :"0"(n_hi), "1"(n_lo))

    #ifdef CONFIG_ACPI
    +#define NR_NODE_MEMBLKS MAX_NUMNODES
    extern int acpi_lapic;
    extern int acpi_ioapic;
    extern int acpi_noirq;
    Index: linux-x86.q/include/linux/acpi.h
    ===================================================================
    --- linux-x86.q.orig/include/linux/acpi.h
    +++ linux-x86.q/include/linux/acpi.h
    @@ -95,7 +95,6 @@ void acpi_table_print_madt_entry (struct

    /* the following four functions are architecture-dependent */
    #ifdef CONFIG_HAVE_ARCH_PARSE_SRAT
    -#define NR_NODE_MEMBLKS MAX_NUMNODES
    #define acpi_numa_slit_init(slit) do {} while (0)
    #define acpi_numa_processor_affinity_init(pa) do {} while (0)
    #define acpi_numa_memory_affinity_init(ma) do {} while (0)

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