[PATCH v4 net-next 04/11] skbuff: simplify __alloc_skb() a bit

From: Alexander Lobakin <alobakin@pm.me>
To: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>
Cc: "Jonathan Lemon" <jonathan.lemon@gmail.com>,
	"Eric Dumazet" <edumazet@google.com>,
	"Dmitry Vyukov" <dvyukov@google.com>,
	"Willem de Bruijn" <willemb@google.com>,
	"Alexander Lobakin" <alobakin@pm.me>,
	"Randy Dunlap" <rdunlap@infradead.org>,
	"Kevin Hao" <haokexin@gmail.com>,
	"Pablo Neira Ayuso" <pablo@netfilter.org>,
	"Jakub Sitnicki" <jakub@cloudflare.com>,
	"Marco Elver" <elver@google.com>,
	"Dexuan Cui" <decui@microsoft.com>,
	"Paolo Abeni" <pabeni@redhat.com>,
	"Jesper Dangaard Brouer" <brouer@redhat.com>,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Andrii Nakryiko" <andriin@fb.com>,
	"Taehee Yoo" <ap420073@gmail.com>,
	"Cong Wang" <xiyou.wangcong@gmail.com>,
	"Björn Töpel" <bjorn@kernel.org>,
	"Miaohe Lin" <linmiaohe@huawei.com>,
	"Guillaume Nault" <gnault@redhat.com>,
	"Yonghong Song" <yhs@fb.com>, zhudi <zhudi21@huawei.com>,
	"Michal Kubecek" <mkubecek@suse.cz>,
	"Marcelo Ricardo Leitner" <marcelo.leitner@gmail.com>,
	"Dmitry Safonov" <0x7f454c46@gmail.com>,
	"Yang Yingliang" <yangyingliang@huawei.com>,
	"Florian Westphal" <fw@strlen.de>,
	"Edward Cree" <ecree.xilinx@gmail.com>,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH v4 net-next 04/11] skbuff: simplify __alloc_skb() a bit
Date: Wed, 10 Feb 2021 16:29:24 +0000	[thread overview]
Message-ID: <20210210162732.80467-5-alobakin@pm.me> (raw)
In-Reply-To: <20210210162732.80467-1-alobakin@pm.me>

Use unlikely() annotations for skbuff_head and data similarly to the
two other allocation functions and remove totally redundant goto.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 net/core/skbuff.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c7d184e11547..88566de26cd1 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -339,8 +339,8 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 
 	/* Get the HEAD */
 	skb = kmem_cache_alloc_node(cache, gfp_mask & ~__GFP_DMA, node);
-	if (!skb)
-		goto out;
+	if (unlikely(!skb))
+		return NULL;
 	prefetchw(skb);
 
 	/* We do our best to align skb_shared_info on a separate cache
@@ -351,7 +351,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 	size = SKB_DATA_ALIGN(size);
 	size += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 	data = kmalloc_reserve(size, gfp_mask, node, &pfmemalloc);
-	if (!data)
+	if (unlikely(!data))
 		goto nodata;
 	/* kmalloc(size) might give us more room than requested.
 	 * Put skb_shared_info exactly at the end of allocated zone,
@@ -395,12 +395,11 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 
 	skb_set_kcov_handle(skb, kcov_common_handle());
 
-out:
 	return skb;
+
 nodata:
 	kmem_cache_free(cache, skb);
-	skb = NULL;
-	goto out;
+	return NULL;
 }
 EXPORT_SYMBOL(__alloc_skb);
 
-- 
2.30.1


