From: Huaisheng Ye <yehs1@lenovo.com>
Date: Mon, 30 Jul 2018 07:15:47 +0000 (+0800)
Subject: md/dm-writecache: Don't request pointer dummy_addr when not required
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f742267ae91faf241d2892878208dffc586ffe06;p=linux.git

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>
---

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index 5961c7794ef37..1839236a0f815 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;