On Tue, 2015-05-12 at 10:51 -0400, Tom Herbert wrote:

I don't see these errors with sparse. How are you running it?

Thanks,
Tom

root@edumazet-glaptop2:/usr/src/net-next# sparse --version
0.4.5-rc1
root@edumazet-glaptop2:/usr/src/net-next# make C=2 CF=-D__CHECK_ENDIAN__
M=net/ipv4
  CHECK   net/ipv4/route.c
  CHECK   net/ipv4/inetpeer.c
  CHECK   net/ipv4/protocol.c
  CHECK   net/ipv4/ip_input.c
  CHECK   net/ipv4/ip_fragment.c
  CHECK   net/ipv4/ip_forward.c
  CHECK   net/ipv4/ip_options.c
  CHECK   net/ipv4/ip_output.c
...
  CHECK   net/ipv4/tcp_offload.c
net/ipv4/tcp_offload.c:139:60: warning: incorrect type in argument 2
(different base types)
net/ipv4/tcp_offload.c:139:60:    expected restricted __wsum [usertype]
res
net/ipv4/tcp_offload.c:139:60:    got fouled restricted __sum16
include/linux/skbuff.h:3362:14: warning: incorrect type in assignment
(different base types)
include/linux/skbuff.h:3362:14:    expected unsigned short [unsigned]
[usertype] csum
include/linux/skbuff.h:3362:14:    got restricted __sum16
include/linux/skbuff.h:3367:16: warning: incorrect type in return
expression (different base types)
include/linux/skbuff.h:3367:16:    expected restricted __sum16
include/linux/skbuff.h:3367:16:    got unsigned short [unsigned]
[usertype] csum
net/ipv4/tcp_offload.c:173:52: warning: incorrect type in argument 2
(different base types)
net/ipv4/tcp_offload.c:173:52:    expected restricted __wsum [usertype]
res
net/ipv4/tcp_offload.c:173:52:    got fouled restricted __sum16
include/linux/skbuff.h:3362:14: warning: incorrect type in assignment
(different base types)
include/linux/skbuff.h:3362:14:    expected unsigned short [unsigned]
[usertype] csum
include/linux/skbuff.h:3362:14:    got restricted __sum16
include/linux/skbuff.h:3367:16: warning: incorrect type in return
expression (different base types)
include/linux/skbuff.h:3367:16:    expected restricted __sum16
include/linux/skbuff.h:3367:16:    got unsigned short [unsigned]
[usertype] csum
  CHECK   net/ipv4/gre_offload.c
include/linux/skbuff.h:3362:14: warning: incorrect type in assignment
(different base types)
include/linux/skbuff.h:3362:14:    expected unsigned short [unsigned]
[usertype] csum
include/linux/skbuff.h:3362:14:    got restricted __sum16
include/linux/skbuff.h:3367:16: warning: incorrect type in return
expression (different base types)
include/linux/skbuff.h:3367:16:    expected restricted __sum16
include/linux/skbuff.h:3367:16:    got unsigned short [unsigned]
[usertype] csum