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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2005-09-17 14:41:40 +1000 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2005-10-30 11:14:39 +1100 |
| commit | d32311fed70d12f14e585feb4653571b1e2b0e6d (patch) | |
| tree | e1bea01c55c1632ed6291ca96f18518ad2abe39b /include/linux/scatterlist.h | |
| parent | be15cd72d256e5eb3261a781b8507fac83ab33f6 (diff) | |
| download | lwn-d32311fed70d12f14e585feb4653571b1e2b0e6d.tar.gz lwn-d32311fed70d12f14e585feb4653571b1e2b0e6d.zip | |
[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 <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/linux/scatterlist.h')
| -rw-r--r-- | include/linux/scatterlist.h | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 7f717e95ae37..66ff545552f7 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 <asm/scatterlist.h> +#include <linux/mm.h> +#include <linux/string.h> +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 */ |