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    Subject[PATCH 4.9 108/153] hv: allocate synic pages for all present CPUs
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Vitaly Kuznetsov <vkuznets@redhat.com>

    commit 421b8f20d3c381b215f988b42428f56fc3b82405 upstream.

    It may happen that not all CPUs are online when we do hv_synic_alloc() and
    in case more CPUs come online later we may try accessing these allocated
    structures.

    Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
    Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/hv/hv.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/drivers/hv/hv.c
    +++ b/drivers/hv/hv.c
    @@ -411,7 +411,7 @@ int hv_synic_alloc(void)
    goto err;
    }

    - for_each_online_cpu(cpu) {
    + for_each_present_cpu(cpu) {
    hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
    if (hv_context.event_dpc[cpu] == NULL) {
    pr_err("Unable to allocate event dpc\n");
    @@ -482,7 +482,7 @@ void hv_synic_free(void)
    int cpu;

    kfree(hv_context.hv_numa_map);
    - for_each_online_cpu(cpu)
    + for_each_present_cpu(cpu)
    hv_synic_free_cpu(cpu);
    }


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