async_tx: add sum check flags

Replace the flat zero_sum_result with a collection of flags to contain
the P (xor) zero-sum result, and the soon to be utilized Q (raid6 reed
solomon syndrome) zero-sum result.  Use the SUM_CHECK_ namespace instead
of DMA_ since these flags will be used on non-dma-zero-sum enabled
platforms.

Reviewed-by: Andre Noll <maan@systemlinux.org>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2 files changed, 4 insertions, 3 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 7727954cf726..1f2a266f3cf7 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2590,7 +2590,7 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh,
                  * we are done.  Otherwise update the mismatch count and repair
                  * parity if !MD_RECOVERY_CHECK
                  */
-                if (sh->ops.zero_sum_result == 0)
+                if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0)
                         /* parity is correct (on disc,
                          * not in buffer any more)
                          */
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index e7baabffee86..75f2c6c4cf90 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -2,6 +2,7 @@
 #define _RAID5_H
 
 #include <linux/raid/xor.h>
+#include <linux/dmaengine.h>
 
 /*
  *
@@ -215,8 +216,8 @@ struct stripe_head {
          * @target - STRIPE_OP_COMPUTE_BLK target
          */
         struct stripe_operations {
-                int                target;
-                u32                zero_sum_result;
+                int                  target;
+                enum sum_check_flags zero_sum_result;
         } ops;
         struct r5dev {
                 struct bio      req;