Messages in this thread Patch in this message | | | From | Sebastian Andrzej Siewior <> | Subject | [PATCH] scatterlist: add a warning if sg_virt() is used on highmem pages | Date | Wed, 5 Dec 2012 12:28:18 +0100 |
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sg_virt() on highmem pages won't work. This WARN_ON() should catch some that still try.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@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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