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Date:   Sat, 13 Mar 2021 11:37:27 +0000
To:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
From:   Alexander Lobakin <alobakin@pm.me>
Cc:     Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
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        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
        Jonathan Lemon <jonathan.lemon@gmail.com>,
        Alexander Lobakin <alobakin@pm.me>,
        Eric Dumazet <edumazet@google.com>,
        Willem de Bruijn <willemb@google.com>,
        Kevin Hao <haokexin@gmail.com>,
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Reply-To: Alexander Lobakin <alobakin@pm.me>
Subject: [PATCH v2 net-next 2/6] skbuff: make __skb_header_pointer()'s data argument const
Message-ID: <20210313113645.5949-3-alobakin@pm.me>
In-Reply-To: <20210313113645.5949-1-alobakin@pm.me>
References: <20210313113645.5949-1-alobakin@pm.me>
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Precedence: bulk

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@pm.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,
 =09=09    __wsum csum);

 static inline void * __must_check
-__skb_header_pointer(const struct sk_buff *skb, int offset,
-=09=09     int len, void *data, int hlen, void *buffer)
+__skb_header_pointer(const struct sk_buff *skb, int offset, int len,
+=09=09     const void *data, int hlen, void *buffer)
 {
 =09if (hlen - offset >=3D len)
-=09=09return data + offset;
+=09=09return (void *)data + offset;

 =09if (!skb ||
 =09    skb_copy_bits(skb, offset, buffer, len) < 0)
--
2.30.2