Add CONFIG_DEBUG_SG sg validation
Add a Kconfig entry which will toggle some sanity checks on the sg
entry and tables.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/include/asm-avr32/scatterlist.h b/include/asm-avr32/scatterlist.h
index 1356f29..377320e 100644
--- a/include/asm-avr32/scatterlist.h
+++ b/include/asm-avr32/scatterlist.h
@@ -4,6 +4,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
dma_addr_t dma_address;