linux-kernel - [PATCH v3 net-next 2/6] skbuff: make __skb_header

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Message-ID: <20210314111027.7657-3-alobakin@pm.me>
Date:   Sun, 14 Mar 2021 11:11:14 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexander Lobakin <alobakin@...me>,
        Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Kevin Hao <haokexin@...il.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Marco Elver <elver@...gle.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Ariel Levkovich <lariel@...lanox.com>,
        Wang Qing <wangqing@...o.com>,
        Davide Caratti <dcaratti@...hat.com>,
        Guillaume Nault <gnault@...hat.com>,
        Eran Ben Elisha <eranbe@...dia.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH v3 net-next 2/6] skbuff: make __skb_header_pointer()'s data argument const

The function never modifies the input buffer, so 'data' argument
can be marked as const.
This implies one harmless cast-away.

Signed-off-by: Alexander Lobakin <alobakin@...me>
---
 include/linux/skbuff.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 483e89348f78..d6ea3dc3eddb 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3678,11 +3678,11 @@ __wsum skb_checksum(const struct sk_buff *skb, int offset, int len,
 		    __wsum csum);

 static inline void * __must_check
-__skb_header_pointer(const struct sk_buff *skb, int offset,
-		     int len, void *data, int hlen, void *buffer)
+__skb_header_pointer(const struct sk_buff *skb, int offset, int len,
+		     const void *data, int hlen, void *buffer)
 {
 	if (hlen - offset >= len)
-		return data + offset;
+		return (void *)data + offset;

 	if (!skb ||
 	    skb_copy_bits(skb, offset, buffer, len) < 0)
--
2.30.2