From: Alan Mikhak <[email protected]> Update the description of sg_set_page() to communicate current requirements for the page pointer parameter.
Signed-off-by: Alan Mikhak <[email protected]> --- include/linux/scatterlist.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 6eec50fb36c8..6dda865893aa 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -112,6 +112,12 @@ static inline void sg_assign_page(struct scatterlist *sg, struct page *page) * of the page pointer. See sg_page() for looking up the page belonging * to an sg entry. * + * Scatterlist currently expects the page parameter to be a pointer to + * a page that is backed by a page struct. + * + * Page pointers derived from addresses obtained from ioremap() are + * currently not supported since they require use of iomem safe memcpy. + * **/ static inline void sg_set_page(struct scatterlist *sg, struct page *page, unsigned int len, unsigned int offset) -- 2.7.4
