Commit 1f1c1d7c authored Dec 13, 2019 by Sven Eckelmann Committed by David S. Miller Dec 16, 2019

ipv6: Annotate bitwise IPv6 dsfield pointer cast

The sparse commit 6002ded74587 ("add a flag to warn on casts to/from
bitwise pointers") introduced a check for non-direct casts from/to
restricted datatypes (when -Wbitwise-pointer is enabled).

This triggered a warning in ipv6_get_dsfield() because sparse doesn't know
that the buffer already points to some data in the correct bitwise integer
format. This was already fixed in ipv6_change_dsfield() by the __force
attribute and can be fixed here the same way.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent f3259377

include/net/dsfield.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -21,7 +21,7 @@ static inline __u8 ipv4_get_dsfield(const struct iphdr *iph)

		static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
		{
		return ntohs((const __be16 )ipv6h) >> 4;
		return ntohs((__force const __be16 )ipv6h) >> 4;
		}

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