From 1f1c1d7c89ee538f3e36b43098e95973f8fa37db Mon Sep 17 00:00:00 2001 From: Sven Eckelmann Date: Fri, 13 Dec 2019 21:24:27 +0100 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- include/net/dsfield.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/dsfield.h b/include/net/dsfield.h index 1a245ee10c95..a59a57ffc546 100644 --- a/include/net/dsfield.h +++ b/include/net/dsfield.h @@ -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; }