[SG] Add debug check for page alignment

Suggested by Boaz Harrosh <[e-mail]>

Signed-off-by: Jens Axboe <[e-mail]>

include/linux/scatterlist.h

···
 {
 	unsigned long page_link = sg->page_link & 0x3;
 
+	/*
+	 * In order for the low bit stealing approach to work, pages
+	 * must be aligned at a 32-bit boundary as a minimum.
+	 */
+	BUG_ON((unsigned long) page & 0x03);
 #ifdef CONFIG_DEBUG_SG
 	BUG_ON(sg->sg_magic != SG_MAGIC);
 #endif