From: Andrew Morton <akpm@linux-foundation.org>
To: Alasdair G Kergon <agk@redhat.com>
Cc: dm-devel@redhat.com, linux-kernel@vger.kernel.org,
Heinz Mauelshagen <hjm@redhat.com>
Subject: Re: [2.6.22 PATCH 22/26] dm: bio list helpers
Date: Tue, 8 May 2007 17:41:59 -0700 [thread overview]
Message-ID: <20070508174159.7d78a275.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070508194845.GC24114@agk.fab.redhat.com>
On Tue, 8 May 2007 20:48:45 +0100
Alasdair G Kergon <agk@redhat.com> wrote:
> +#define BIO_LIST_INIT { .head = NULL, .tail = NULL }
> +
> +#define BIO_LIST(bl) \
> + struct bio_list bl = BIO_LIST_INIT
BIO_LIST is a strange name for something which initialises storage.
> static inline void bio_list_init(struct bio_list *bl)
> {
> bl->head = bl->tail = NULL;
> }
>
> +#define bio_list_for_each(bio, bl) \
> + for (bio = (bl)->head; bio && ({ prefetch(bio->bi_next); 1; }); \
> + bio = bio->bi_next)
> +
I have this vague memory from a long time ago that one particular CPU type
wants to go oops when prefetching from an invalid address.
Maybe that went away for some reason - we'd have hit it again if it was
real.
next prev parent reply other threads:[~2007-05-09 0:42 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-08 19:48 [2.6.22 PATCH 22/26] dm: bio list helpers Alasdair G Kergon
2007-05-09 0:41 ` Andrew Morton [this message]
2007-05-09 6:49 ` Jens Axboe
2007-05-09 15:54 ` Alasdair G Kergon
2007-05-10 14:17 ` Jan Engelhardt
2007-05-10 14:29 ` Alan Cox
2007-05-10 21:40 ` Jens Axboe
2007-05-09 15:47 ` Alasdair G Kergon
2007-05-10 13:41 ` Andi Kleen
2007-05-10 14:17 ` Jan Engelhardt
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