netdev - Re: [PATCH net-next] vxlan: fix rcu related warnings

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Message-ID: <20130730160245.4b7b84a1@nehalam.linuxnetplumber.net>
Date:	Tue, 30 Jul 2013 16:02:45 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Pravin Shelar <pshelar@...ira.com>
Cc:	David Miller <davem@...emloft.net>,
	Thomas Richter <tmricht@...ux.vnet.ibm.com>,
	Mike Rapoport <mike.rapoport@...ellosystems.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] vxlan: fix rcu related warnings

On Tue, 30 Jul 2013 15:17:21 -0700
Pravin Shelar <pshelar@...ira.com> wrote:

> On Tue, Jul 30, 2013 at 1:18 PM, Stephen Hemminger
> <stephen@...workplumber.org> wrote:
> > Vxlan remote list is protected by RCU but since first_remote
> > returns a bare pointer, sparse complains.
> > Split out the rcu and non-rcu access to the list.
> >
> > Ok to replace list_for_or_null with just list_entry_rcu because
> > remotes list must be non-empty.
> >
> I am still getting following sparse waning.
> 
>   CHECK   drivers/net/vxlan.c
> drivers/net/vxlan.c:181:16: warning: incorrect type in return
> expression (different address spaces)
> drivers/net/vxlan.c:181:16:    expected struct vxlan_rdst [noderef] <asn:4>*
> drivers/net/vxlan.c:181:16:    got struct vxlan_rdst *<noident>
> drivers/net/vxlan.c:748:59: warning: incorrect type in initializer
> (different address spaces)
> drivers/net/vxlan.c:748:59:    expected struct vxlan_rdst *rdst
> drivers/net/vxlan.c:748:59:    got struct vxlan_rdst [noderef] <asn:4>*
> drivers/net/vxlan.c:181:16: warning: incorrect type in return
> expression (different address spaces)
> drivers/net/vxlan.c:181:16:    expected struct vxlan_rdst [noderef] <asn:4>*
> drivers/net/vxlan.c:181:16:    got struct vxlan_rdst *<noident>
> drivers/net/vxlan.c:996:42: warning: dereference of noderef expression
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Which version of sparse? I don't see this with latest version.

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