af_packet: eliminate pgv_to_page on some arches
Some arches don't need flush_dcache_page(), and don't implement it, so
we can eliminate pgv_to_page() calls on those arches.
Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 17eafe5..9292ec9 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -223,7 +223,7 @@
#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
-static inline struct page *pgv_to_page(void *addr)
+static inline __pure struct page *pgv_to_page(void *addr)
{
if (is_vmalloc_addr(addr))
return vmalloc_to_page(addr);
@@ -806,6 +806,7 @@
__packet_set_status(po, h.raw, status);
smp_mb();
+#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
{
u8 *start, *end;
@@ -813,6 +814,7 @@
for (start = h.raw; start < end; start += PAGE_SIZE)
flush_dcache_page(pgv_to_page(start));
}
+#endif
sk->sk_data_ready(sk, 0);