From mboxrd@z Thu Jan 1 00:00:00 1970 From: Changli Gao Subject: [PATCH] af_packet: eliminate pgv_to_page on some arches Date: Tue, 7 Dec 2010 22:26:16 +0800 Message-ID: <1291731976-15793-1-git-send-email-xiaosuo@gmail.com> Cc: Eric Dumazet , Jiri Pirko , Neil Horman , netdev@vger.kernel.org, Changli Gao To: "David S. Miller" Return-path: Received: from mail-gx0-f180.google.com ([209.85.161.180]:48965 "EHLO mail-gx0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752505Ab0LGO0d (ORCPT ); Tue, 7 Dec 2010 09:26:33 -0500 Received: by gxk19 with SMTP id 19so7592971gxk.11 for ; Tue, 07 Dec 2010 06:26:33 -0800 (PST) Sender: netdev-owner@vger.kernel.org List-ID: 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 --- net/packet/af_packet.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index a11c731..0e152b1 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -223,7 +223,7 @@ struct packet_skb_cb { #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); @@ -805,6 +805,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, __packet_set_status(po, h.raw, status); smp_mb(); +#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 { u8 *start, *end; @@ -812,6 +813,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, for (start = h.raw; start < end; start += PAGE_SIZE) flush_dcache_page(pgv_to_page(start)); } +#endif sk->sk_data_ready(sk, 0);