netdev - Re: [PATCH net-next] ipv6: fix sparse warning

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Message-ID: <1418190018.27198.12.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 09 Dec 2014 21:40:18 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ying Xue <ying.xue@...driver.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipv6: fix sparse warning

On Wed, 2014-12-10 at 11:28 +0800, Ying Xue wrote:
> This fixes the following sparse warning when using
> 
> make C=1 CF=-D__CHECK_ENDIAN__ net/ipv6/addrconf.o
> net/ipv6/addrconf.c:3495:9: error: incompatible types in comparison expression (different address spaces)
> net/ipv6/addrconf.c:3495:9: error: incompatible types in comparison expression (different address spaces)
> net/ipv6/addrconf.c:3495:9: error: incompatible types in comparison expression (different address spaces)
> net/ipv6/addrconf.c:3495:9: error: incompatible types in comparison expression (different address spaces)
> 
> To silence above spare complaint, an RCU annotation should be added
> to next pointer of hlist_node structure through hlist_next_rcu() macro
> when iterating over a hlist with hlist_for_each_entry_continue_rcu_bh().
> 
> By the way, this commit also resolves the same error appearing in
> hlist_for_each_entry_continue_rcu().

This probably should be sent to lkml and CC Paul E. McKenney


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