netdev - Re: [PATCH net-next] net: fix two sparse errors

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Date:	Fri, 15 May 2015 17:23:31 +0200
From:	Sabrina Dubroca <sd@...asysnail.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Tom Herbert <tom@...bertland.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: fix two sparse errors

2015-05-15, 07:52:37 -0700, Eric Dumazet wrote:
> On Fri, 2015-05-15 at 16:35 +0200, Sabrina Dubroca wrote:
> > Hi Eric,
> > 
> > 2015-05-15, 05:48:07 -0700, Eric Dumazet wrote:
> > > From: Eric Dumazet <edumazet@...gle.com>
> > > 
> > > First one in __skb_checksum_validate_complete() fixes the following
> > > (and other callers)
> > > 
> > > make C=2 CF=-D__CHECK_ENDIAN__ net/ipv4/tcp_ipv4.o
> > >   CHECK   net/ipv4/tcp_ipv4.c
> > > include/linux/skbuff.h:3052:24: warning: incorrect type in return expression (different base types)
> > > include/linux/skbuff.h:3052:24:    expected restricted __sum16
> > > include/linux/skbuff.h:3052:24:    got int
> > > 
> > > Second is fixing gso_make_checksum() :
> > > 
> > >   CHECK   net/ipv4/gre_offload.c
> > > include/linux/skbuff.h:3360:14: warning: incorrect type in assignment (different base types)
> > > include/linux/skbuff.h:3360:14:    expected unsigned short [unsigned] [usertype] csum
> > > include/linux/skbuff.h:3360:14:    got restricted __sum16
> > > include/linux/skbuff.h:3365:16: warning: incorrect type in return expression (different base types)
> > > include/linux/skbuff.h:3365:16:    expected restricted __sum16
> > > include/linux/skbuff.h:3365:16:    got unsigned short [unsigned] [usertype] csum
> > > 
> > > 
> > > Fixes: 5a21232983aa7 ("net: Support for csum_bad in skbuff")
> > > Fixes: 7e2b10c1e52ca ("net: Support for multiple checksums with gso")
> > > Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> > > CC: Tom Herbert <tom@...bertland.com>
> > > ---
> > 
> > That's very similar to what I submitted in February:
> > https://patchwork.ozlabs.org/patch/437332/
> 
> Well, given you did not address David concerns, and Tom apparently does
> not know how to use sparse, I finally gave up.

Sorry :(

But I don't see how doing the same thing for
__skb_checksum_validate_complete will address David's concerns.

I really have no problem with your submission, I just thought that it
might not satisfy David.
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