linux-kernel - Re: [PATCH 01/18] kernel: add bl

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Date:	Fri, 08 Oct 2010 10:18:40 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/18] kernel: add bl_list

Dave Chinner <david@...morbit.com> writes:

> +static inline void __hlist_bl_del(struct hlist_bl_node *n)
> +{
> +	struct hlist_bl_node *next = n->next;
> +	struct hlist_bl_node **pprev = n->pprev;
> +
> +	LIST_BL_BUG_ON((unsigned long)n & LIST_BL_LOCKMASK);
> +
> +	/* pprev may be `first`, so be careful not to lose the lock bit */
> +	*pprev = (struct hlist_bl_node *)
> +			((unsigned long)next |
> +			 ((unsigned long)*pprev & LIST_BL_LOCKMASK));
> +	if (next)
> +		next->pprev = pprev;
> +}

Should this set n->pprev to NULL so that unhashed returns true
afterwards?


> +
> +static inline void hlist_bl_del(struct hlist_bl_node *n)
> +{
> +	__hlist_bl_del(n);
> +	n->next = BL_LIST_POISON1;
> +	n->pprev = BL_LIST_POISON2;
> +}

Ok so unhashed only works once. Seems unsymmetric.

Other than that looks good to me.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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