From 1f1c1d7c89ee538f3e36b43098e95973f8fa37db Mon Sep 17 00:00:00 2001
From: Sven Eckelmann <sven@narfation.org>
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 <sven@narfation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
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 1a245ee10c951..a59a57ffc5468 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;
}
--
2.30.2