net: page pool: allow to pass zero flags to page_pool_init()
page pool API can be useful for non-DMA cases like xen-netfront driver so let's allow to pass zero flags to page pool flags. v2: check DMA direction only if PP_FLAG_DMA_MAP is set Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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