Subject: Re: linux-next: manual merge of the rcu tree with the net tree

From: "Paul E. McKenney" <[email-masked]>
Date: Tue, 3 May 2011 23:05:33 -0700

On Tue, May 03, 2011 at 02:24:19PM +1000, Stephen Rothwell wrote:
> Hi Paul,
> 
> Today's linux-next merge of the rcu tree got a conflict in
> net/core/filter.c between commit 0a14842f5a3c ("net: filter: Just In Time
> compiler for x86-64") from the net tree and commit 10cde158c259
> ("net,rcu: convert call_rcu(sk_filter_release_rcu) to kfree_rcu") from
> the rcu tree.
> 
> The former adds another operation into sk_filter_release_rcu(), so I have
> effectively reverted the rcu tree change for now (by applying the patch
> below as a merge fixup).

Thank you, Stephen!

Looks like I need to get my changes forward-ported to the latest -rc...

						Thanx, Paul

> -- 
> Cheers,
> Stephen Rothwell                    [email-masked]
> 
> From: Stephen Rothwell <[email-masked]>
> Date: Tue, 3 May 2011 14:06:50 +1000
> Subject: [PATCH] Revert "net,rcu: convert call_rcu(sk_filter_release_rcu) to
>  kfree_rcu"
> 
> This reverts commit 10cde158c2591422a2b32a2f560f406b8e69bee6.
> ---
>  include/net/sock.h |    4 +++-
>  net/core/filter.c  |   13 +++++++++++++
>  2 files changed, 16 insertions(+), 1 deletions(-)
> 
> diff --git a/include/net/sock.h b/include/net/sock.h
> index 1a2f255..f2046e4 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -1180,6 +1180,8 @@ extern void sk_common_release(struct sock *sk);
>  /* Initialise core socket variables */
>  extern void sock_init_data(struct socket *sock, struct sock *sk);
> 
> +extern void sk_filter_release_rcu(struct rcu_head *rcu);
> +
>  /**
>   *	sk_filter_release - release a socket filter
>   *	@fp: filter to remove
> @@ -1190,7 +1192,7 @@ extern void sock_init_data(struct socket *sock, struct sock *sk);
>  static inline void sk_filter_release(struct sk_filter *fp)
>  {
>  	if (atomic_dec_and_test(&fp->refcnt))
> -		kfree_rcu(fp, rcu);
> +		call_rcu(&fp->rcu, sk_filter_release_rcu);
>  }
> 
>  static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 66d403d..0eb8c44 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -572,6 +572,19 @@ int sk_chk_filter(struct sock_filter *filter, int flen)
>  EXPORT_SYMBOL(sk_chk_filter);
> 
>  /**
> + * 	sk_filter_release_rcu - Release a socket filter by rcu_head
> + *	@rcu: rcu_head that contains the sk_filter to free
> + */
> +void sk_filter_release_rcu(struct rcu_head *rcu)
> +{
> +	struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
> +
> +	bpf_jit_free(fp);
> +	kfree(fp);
> +}
> +EXPORT_SYMBOL(sk_filter_release_rcu);
> +
> +/**
>   *	sk_attach_filter - attach a socket filter
>   *	@fprog: the filter program
>   *	@sk: the socket to use
> -- 
> 1.7.4.4
>