From c8164d8931fdee9ac5314708c4071adf1d997425 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Wed, 20 Mar 2013 15:37:08 +1030 Subject: scatterlist: introduce sg_unmark_end This is useful in places that recycle the same scatterlist multiple times, and do not want to incur the cost of sg_init_table every time in hot paths. Acked-by: Jens Axboe Signed-off-by: Paolo Bonzini Signed-off-by: Rusty Russell --- include/linux/scatterlist.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'include/linux/scatterlist.h') diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 2d8bdaef9611..bfc47e0de81c 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -171,6 +171,22 @@ static inline void sg_mark_end(struct scatterlist *sg) sg->page_link &= ~0x01; } +/** + * sg_unmark_end - Undo setting the end of the scatterlist + * @sg: SG entryScatterlist + * + * Description: + * Removes the termination marker from the given entry of the scatterlist. + * + **/ +static inline void sg_unmark_end(struct scatterlist *sg) +{ +#ifdef CONFIG_DEBUG_SG + BUG_ON(sg->sg_magic != SG_MAGIC); +#endif + sg->page_link &= ~0x02; +} + /** * sg_phys - Return physical address of an sg entry * @sg: SG entry -- cgit v1.2.3