Sparse reports false positives for the header manipulation inlines. Annotate
them correctly.
Tested by sparse on a little endian and big endian machine.
Fixes: 54bfd872bf16d ("vxlan: keep flags and vni in network byte order")
Reported-by: kbuild test robot <fengguang...@intel.com>
Signed-off-by: Jiri Benc <jb...@redhat.com>
---
As a side note, I tried to simplify all of these functions by using nested
be32_to_cpu(cpu_to_be32()) calls but GCC seems not to be clever enough to
optimize the byteswaps out.
---
include/net/vxlan.h | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index a763c96ecde4..73ed2e951c02 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -271,36 +271,36 @@ static inline struct vxlanhdr *vxlan_hdr(struct sk_buff
*skb)
static inline __be32 vxlan_vni(__be32 vni_field)
{
#if defined(__BIG_ENDIAN)
- return vni_field >> 8;
+ return (__force __be32)((__force u32)vni_field >> 8);
#else
- return (vni_field & VXLAN_VNI_MASK) << 8;
+ return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
#endif
}
static inline __be32 vxlan_vni_field(__be32 vni)
{
#if defined(__BIG_ENDIAN)
- return vni << 8;
+ return (__force __be32)((__force u32)vni << 8);
#else
- return vni >> 8;
+ return (__force __be32)((__force u32)vni >> 8);
#endif
}
static inline __be32 vxlan_tun_id_to_vni(__be64 tun_id)
{
#if defined(__BIG_ENDIAN)
- return tun_id;
+ return (__force __be32)tun_id;
#else
- return tun_id >> 32;
+ return (__force __be32)((__force u64)tun_id >> 32);
#endif
}
static inline __be64 vxlan_vni_to_tun_id(__be32 vni)
{
#if defined(__BIG_ENDIAN)
- return (__be64)vni;
+ return (__force __be64)vni;
#else
- return (__be64)vni << 32;
+ return (__force __be64)((u64)(__force u32)vni << 32);
#endif
}
--
1.8.3.1
