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Commit de26103d authored by Jens Axboe's avatar Jens Axboe
Browse files

[SG] Add debug check for page alignment 



Suggested by Boaz Harrosh <bharrosh@panasas.com>

Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 0b776eb5

include/linux/scatterlist.h

+5 −0
Original line number Diff line number Diff line
@@ -41,6 +41,11 @@ static inline void sg_set_page(struct scatterlist *sg, struct page *page) 
{

	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