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    Subject[tip: irq/core] irqchip/gic-v4.1: Skip absent CPUs while iterating over redistributors
    The following commit has been merged into the irq/core branch of tip:

    Commit-ID: 28d160de5194c68ff534443d2a8b6f1d10d57c58
    Gitweb: https://git.kernel.org/tip/28d160de5194c68ff534443d2a8b6f1d10d57c58
    Author: Marc Zyngier <maz@kernel.org>
    AuthorDate: Wed, 04 Mar 2020 20:33:09
    Committer: Marc Zyngier <maz@kernel.org>
    CommitterDate: Thu, 19 Mar 2020 11:21:58

    irqchip/gic-v4.1: Skip absent CPUs while iterating over redistributors

    In a system that is only sparsly populated with CPUs, we can end-up with
    redistributors structures that are not initialized. Let's make sure we
    don't try and access those when iterating over them (in this case when
    checking we have a L2 VPE table).

    Fixes: 4e6437f12d6e ("irqchip/gic-v4.1: Ensure L2 vPE table is allocated at RD level")
    Signed-off-by: Marc Zyngier <maz@kernel.org>
    Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
    Reviewed-by: Eric Auger <eric.auger@redhat.com>
    Link: https://lore.kernel.org/r/20200304203330.4967-3-maz@kernel.org
    ---
    drivers/irqchip/irq-gic-v3-its.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
    index 83b1186..da883a6 100644
    --- a/drivers/irqchip/irq-gic-v3-its.c
    +++ b/drivers/irqchip/irq-gic-v3-its.c
    @@ -2452,6 +2452,10 @@ static bool allocate_vpe_l2_table(int cpu, u32 id)
    if (!gic_rdists->has_rvpeid)
    return true;

    + /* Skip non-present CPUs */
    + if (!base)
    + return true;
    +
    val = gicr_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER);

    esz = FIELD_GET(GICR_VPROPBASER_4_1_ENTRY_SIZE, val) + 1;
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