[SCSI] libfc: cache align fc_exch_pool

fix holes and better cache aligned fields.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index 01ff082dc34c..a78655b86cb7 100644
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -65,16 +65,15 @@ static struct workqueue_struct *fc_exch_workqueue;
  * assigned range of exchanges to per cpu pool.
  */
 struct fc_exch_pool {
+        spinlock_t       lock;
+        struct list_head ex_list;
         u16              next_index;
         u16              total_exches;
 
         /* two cache of free slot in exch array */
         u16              left;
         u16              right;
-
-        spinlock_t       lock;
-        struct list_head ex_list;
-};
+} ____cacheline_aligned_in_smp;
 
 /**
  * struct fc_exch_mgr - The Exchange Manager (EM).
@@ -91,13 +90,13 @@ struct fc_exch_pool {
  * It manages the allocation of exchange IDs.
  */
 struct fc_exch_mgr {
+        struct fc_exch_pool *pool;
+        mempool_t       *ep_pool;
         enum fc_class   class;
         struct kref     kref;
         u16             min_xid;
         u16             max_xid;
-        mempool_t       *ep_pool;
         u16             pool_max_index;
-        struct fc_exch_pool *pool;
 
         /*
          * currently exchange mgr stats are updated but not used.