linux-kernel - Re: [PATCH 01/17] kernel: add bl

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Message-Id: <20100929215208.b0206460.akpm@linux-foundation.org>
Date:	Wed, 29 Sep 2010 21:52:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/17] kernel: add bl_list

On Wed, 29 Sep 2010 22:18:33 +1000 Dave Chinner <david@...morbit.com> wrote:

> From: Nick Piggin <npiggin@...e.de>
> 
> Introduce a type of hlist that can support the use of the lowest bit
> in the hlist_head. This will be subsequently used to implement
> per-bucket bit spinlock for inode hashes.
> 
>
> ...
>
> +static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h)
> +{
> +	h->next = NULL;
> +	h->pprev = NULL;
> +}

No need to shout.

>
> ...
>
> +static inline void hlist_bl_del(struct hlist_bl_node *n)
> +{
> +	__hlist_bl_del(n);
> +	n->next = LIST_POISON1;
> +	n->pprev = LIST_POISON2;
> +}

I'd suggest creating new poison values for hlist_bl's, leave
LIST_POISON1 and LIST_POISON2 for list_head (and any other list
variants which went and used them :()

>
> ...
>

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