From f742267ae91faf241d2892878208dffc586ffe06 Mon Sep 17 00:00:00 2001
From: Huaisheng Ye <yehs1@lenovo.com>
Date: Mon, 30 Jul 2018 15:15:47 +0800
Subject: [PATCH] md/dm-writecache: Don't request pointer dummy_addr when not
 required

Function persistent_memory_claim doesn't need to get local pointer
dummy_addr from direct_access. Using NULL instead of having to pass
in a useless local pointer that caller then just throw away.

Suggested-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 drivers/md/dm-writecache.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index 5961c7794ef3..1839236a0f81 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -267,9 +267,8 @@ static int persistent_memory_claim(struct dm_writecache *wc)
 		i = 0;
 		do {
 			long daa;
-			void *dummy_addr;
 			daa = dax_direct_access(wc->ssd_dev->dax_dev, i, p - i,
-						&dummy_addr, &pfn);
+						NULL, &pfn);
 			if (daa <= 0) {
 				r = daa ? daa : -EINVAL;
 				goto err3;
-- 
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