netdev - Re: linux-next: build failure after merge of the tip tree (net tree interaction)

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Date:	Fri, 20 May 2011 09:59:20 +0200
From:	Jacek Luczak <difrost.kernel@...il.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: linux-next: build failure after merge of the tip tree (net tree interaction)

2011/5/20 Stephen Rothwell <sfr@...b.auug.org.au>:
> Hi all,
>
> After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
>
> net/sctp/bind_addr.c: In function 'sctp_bind_addr_clean':
> net/sctp/bind_addr.c:148: error: 'sctp_local_addr_free' undeclared (first use in this function)
>
> Caused by commit 1231f0baa547 ("net,rcu: convert call_rcu
> (sctp_local_addr_free) to kfree_rcu()") interacting with commit
> c182f90bc1f2 ("SCTP: fix race between sctp_bind_addr_free() and
> sctp_bind_addr_conflict()") from the net tree.
>
> I applied the following patch as a merge fix:
>
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Fri, 20 May 2011 14:11:11 +1000
> Subject: [PATCH] net,rcu: convert another call to call_rcu(sctp_local_addr_free)
>
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  net/sctp/bind_addr.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
> index 6338413..83e3011 100644
> --- a/net/sctp/bind_addr.c
> +++ b/net/sctp/bind_addr.c
> @@ -145,7 +145,7 @@ static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
>        /* Empty the bind address list. */
>        list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
>                list_del_rcu(&addr->list);
> -               call_rcu(&addr->rcu, sctp_local_addr_free);
> +               kfree_rcu(addr, rcu);
>                SCTP_DBG_OBJCNT_DEC(addr);
>        }
>  }
> --
> 1.7.5.1
>


Hi

as this is planned to be backported down to stable/longterm, kfree_rcu
was not used here. I guess in meantime the callback has been removed
while introducing kfree_rcu in sctp  module. I have a patch ready to
send for net-next-2.6 converting to kfree_rcu in sctp, only I've been
waiting for it jumping to the tree.

This patch is of course valid.

-Jacek
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