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[SG] Add debug check for page alignment

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Suggested by Boaz Harrosh <bharrosh@panasas.com>

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-10-23 20:35:58 +02:00
parent 0b776eb542
commit de26103de5
1 changed files with 5 additions and 0 deletions
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5
include/linux/scatterlist.h
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@ -41,6 +41,11 @@ static inline void sg_set_page(struct scatterlist *sg, struct page *page)
{ {
unsigned long page_link = sg->page_link & 0x3; 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 #ifdef CONFIG_DEBUG_SG
BUG_ON(sg->sg_magic != SG_MAGIC); BUG_ON(sg->sg_magic != SG_MAGIC);
#endif #endif