[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>
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 7f717e9..66ff545 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 */