linux-kernel - Re: [PATCH] mm: remove all rcu head initializations

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Date:	Wed, 19 May 2010 10:20:56 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org, mingo@...e.hu,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mathieu.desnoyers@...icios.com
Subject: Re: [PATCH] mm: remove all rcu head initializations

Hi

> Hello!
> 
> Would you guys like to carry this patch, or should I push it up
> -tip?  If I don't hear otherwise from you, I will push it up -tip.
> The INIT_RCU_HEAD() primitive is going away in favor of debugobjects.
> 
> 							Thanx, Paul

Personally, I don't think this patch can make major conflict. So, I guess
-tip is best.

Thanks.


> 
> ------------------------------------------------------------------------
> 
> mm: remove all rcu head initializations
> 
> Remove all rcu head inits. We don't care about the RCU head state before passing
> it to call_rcu() anyway. Only leave the "on_stack" variants so debugobjects can
> keep track of objects on stack.
> 
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Cc: Christoph Lameter <cl@...ux-foundation.org>
> Cc: Pekka Enberg <penberg@...helsinki.fi>
> Cc: Matt Mackall <mpm@...enic.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> 
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 707d0dc..f03d8d6 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -663,7 +663,6 @@ int bdi_init(struct backing_dev_info *bdi)
>  	bdi->max_ratio = 100;
>  	bdi->max_prop_frac = PROP_FRAC_BASE;
>  	spin_lock_init(&bdi->wb_lock);
> -	INIT_RCU_HEAD(&bdi->rcu_head);
>  	INIT_LIST_HEAD(&bdi->bdi_list);
>  	INIT_LIST_HEAD(&bdi->wb_list);
>  	INIT_LIST_HEAD(&bdi->work_list);
> diff --git a/mm/slob.c b/mm/slob.c
> index 837ebd6..6de238d 100644
> --- a/mm/slob.c
> +++ b/mm/slob.c
> @@ -647,7 +647,6 @@ void kmem_cache_free(struct kmem_cache *c, void *b)
>  	if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) {
>  		struct slob_rcu *slob_rcu;
>  		slob_rcu = b + (c->size - sizeof(struct slob_rcu));
> -		INIT_RCU_HEAD(&slob_rcu->head);
>  		slob_rcu->size = c->size;
>  		call_rcu(&slob_rcu->head, kmem_rcu_free);
>  	} else {
> 
> --
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