From d32311fed70d12f14e585feb4653571b1e2b0e6d Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sat, 17 Sep 2005 14:41:40 +1000 Subject: [PATCH] [PATCH] Introduce sg_set_buf sg_init_one is a nice tool for the block layer. However, users of struct scatterlist in other subsystems don't usually need the DMA attributes. For them it's a waste of time and space to initialise the whole struct scatterlist structure. Therefore this patch adds a new function sg_set_buf to initialise a scatterlist without zeroing the DMA attributes. Signed-off-by: Herbert Xu --- include/linux/scatterlist.h | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 7f717e95ae3..66ff545552f 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -1,14 +1,23 @@ #ifndef _LINUX_SCATTERLIST_H #define _LINUX_SCATTERLIST_H -static inline void sg_init_one(struct scatterlist *sg, - u8 *buf, unsigned int buflen) -{ - memset(sg, 0, sizeof(*sg)); +#include +#include +#include +static inline void sg_set_buf(struct scatterlist *sg, void *buf, + unsigned int buflen) +{ sg->page = virt_to_page(buf); sg->offset = offset_in_page(buf); sg->length = buflen; } +static inline void sg_init_one(struct scatterlist *sg, void *buf, + unsigned int buflen) +{ + memset(sg, 0, sizeof(*sg)); + sg_set_buf(sg, buf, buflen); +} + #endif /* _LINUX_SCATTERLIST_H */ -- 2.20.1