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

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Date:	Tue, 30 Jul 2013 16:20:27 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
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, Jul 30, 2013 at 4:02 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> 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.
>
I am using sparse from latest git repo.

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