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    Subject[PATCH 36/36] x86: use num_processors for possible cpus
    some systems that have disable cpus entries because same
    BIOS will support 2 sockets and 4 sockets and more at
    same time, BIOS just leave some disable entries, but
    those system do not support cpu hotplug. we don't need
    treat disabled_cpus as hotplug cpus.
    so we can make nr_cpu_ids smaller and save more space
    (pcpu data allocations), and could make some systems run
    with logical flat instead of physical flat apic mode

    -v2: change to black list instead
    -v3: just remove that, and the one use possible_cpus= directly.

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    arch/x86/kernel/smpboot.c | 3 +--
    1 files changed, 1 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
    index f741c33..642440c 100644
    --- a/arch/x86/kernel/smpboot.c
    +++ b/arch/x86/kernel/smpboot.c
    @@ -1190,7 +1190,6 @@ early_param("possible_cpus", _setup_possible_cpus);
    * - Ashok Raj
    *
    * Three ways to find out the number of additional hotplug CPUs:
    - * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
    * - The user can overwrite it with possible_cpus=NUM
    * - Otherwise don't reserve additional CPUs.
    * We do this because additional CPUs waste a lot of memory.
    @@ -1205,7 +1204,7 @@ __init void prefill_possible_map(void)
    num_processors = 1;

    if (setup_possible_cpus == -1)
    - possible = num_processors + disabled_cpus;
    + possible = num_processors;
    else
    possible = setup_possible_cpus;

    --
    1.6.4.2


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