sg_virt() on highmem pages won't work. This WARN_ON() should catch some
that still try.
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
include/linux/scatterlist.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 4bd6c06..4d4adab 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -198,6 +198,9 @@ static inline dma_addr_t sg_phys(struct scatterlist *sg)
**/
static inline void *sg_virt(struct scatterlist *sg)
{
+#ifdef CONFIG_DEBUG_SG
+ WARN_ON(PageHighMem(sg_page(sg)));
+#endif
return page_address(sg_page(sg)) + sg->offset;
}
--
1.7.10.4
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