scatterlist: sg_set_buf() argument must be in linear mapping

Add a check behind CONFIG_DEBUG_SG to verify this. Signed-off-by: Rusty Russell <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
openbmc · May 30, 2013 · ac4e97a · ac4e97a
1 parent 4997b72
commit ac4e97a
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
@@ -111,6 +111,9 @@ static inline struct page *sg_page(struct scatterlist *sg)
 static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
 			      unsigned int buflen)
 {
+#ifdef CONFIG_DEBUG_SG
+	BUG_ON(!virt_addr_valid(buf));
+#endif
 	sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
 }