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ipv6: Annotate bitwise IPv6 dsfield pointer cast

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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>
This commit is contained in:
Sven Eckelmann 2019-12-13 21:24:27 +01:00 • committed by David S. Miller
parent f325937735
commit 1f1c1d7c89
1 changed files with 1 additions and 1 deletions
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2
include/net/dsfield.h
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@ -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;
}