xen-blkfront: switch kcalloc to kvcalloc for large array allocation
There's no reason to request physically contiguous memory for those allocations. [boris: added CC to stable] Cc: stable@vger.kernel.org Reported-by: Ian Jackson <ian.jackson@citrix.com> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Juergen Gross <jgross@suse.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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