Commit de26103d authored by Jens Axboe's avatar Jens Axboe

[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
......@@ -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
......
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