subject line should have net-next as the target branch
On 3/23/21 4:20 AM, Yejune Deng wrote:
> Put if and else if together, and remove unnecessary judgments, because
> it's caller can make sure it is true. And add likely() in
> ipv4_confirm_neigh().
>
> Signed-off-by: Yejune Deng <yejune.d...@gmail.com>
> ---
> net/ipv4/route.c | 18 +++++++-----------
> 1 file changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index fa68c2612252..f4ba07c5c1b1 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -440,7 +440,7 @@ static void ipv4_confirm_neigh(const struct dst_entry
> *dst, const void *daddr)
> struct net_device *dev = dst->dev;
> const __be32 *pkey = daddr;
>
> - if (rt->rt_gw_family == AF_INET) {
> + if (likely(rt->rt_gw_family == AF_INET)) {
> pkey = (const __be32 *)&rt->rt_gw4;
> } else if (rt->rt_gw_family == AF_INET6) {
> return __ipv6_confirm_neigh_stub(dev, &rt->rt_gw6);
> @@ -814,19 +814,15 @@ static void ip_do_redirect(struct dst_entry *dst,
> struct sock *sk, struct sk_buf
>
> static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
> {
> - struct rtable *rt = (struct rtable *)dst;
> + struct rtable *rt = container_of(dst, struct rtable, dst);
> struct dst_entry *ret = dst;
>
> - if (rt) {
> - if (dst->obsolete > 0) {
> - ip_rt_put(rt);
> - ret = NULL;
> - } else if ((rt->rt_flags & RTCF_REDIRECTED) ||
> - rt->dst.expires) {
> - ip_rt_put(rt);
> - ret = NULL;
> - }
> + if (dst->obsolete > 0 || rt->dst.expires ||
> + (rt->rt_flags & RTCF_REDIRECTED)) {
> + ip_rt_put(rt);
> + ret = NULL;
> }
> +
> return ret;
> }
>
>
This should be 2 separate patches since they are unrelated changes.
For the ipv4_negative_advice, the changelog should note that
negative_advice handler is only called when dst is non-NULL hence the
'if (rt)' check can be removed.
