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scatterlist: sg_set_buf() argument must be in linear mapping

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Add a check behind CONFIG_DEBUG_SG to verify this.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Rusty Russell 2013-05-30 09:19:35 +02:00 committed by Jens Axboe
parent 4997b72ee6
commit ac4e97abce
1 changed files with 3 additions and 0 deletions
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include/linux/scatterlist.h
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@ -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));
}