linux-kernel - [PATCH 3/3] fs/dax: Assigning NULL to gfn of dax_direct

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Date:   Wed,  4 Jul 2018 14:40:58 +0800
From:   Huaisheng Ye <yehs2007@...o.com>
To:     linux-nvdimm@...ts.01.org
Cc:     dan.j.williams@...el.com, ross.zwisler@...ux.intel.com,
        mawilcox@...rosoft.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, viro@...iv.linux.org.uk,
        martin.petersen@...cle.com, axboe@...nel.dk,
        gregkh@...uxfoundation.org, bart.vanassche@....com, jack@...e.com,
        chengnt@...ovo.com, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Huaisheng Ye <yehs1@...ovo.com>
Subject: [PATCH 3/3] fs/dax: Assigning NULL to gfn of dax_direct_access if useless

From: Huaisheng Ye <yehs1@...ovo.com>

Some functions within fs/dax don't need to get gfn from direct_access.
Assigning NULL to gfn of dax_direct_access is more intuitive and simple
than offering a useless local variable.

Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
---
 fs/dax.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index aaec72de..aa75dfd 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -550,7 +550,6 @@ static int copy_user_dax(struct block_device *bdev, struct dax_device *dax_dev,
 {
 	void *vto, *kaddr;
 	pgoff_t pgoff;
-	pfn_t pfn;
 	long rc;
 	int id;
 
@@ -559,7 +558,7 @@ static int copy_user_dax(struct block_device *bdev, struct dax_device *dax_dev,
 		return rc;
 
 	id = dax_read_lock();
-	rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
+	rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, NULL);
 	if (rc < 0) {
 		dax_read_unlock(id);
 		return rc;
@@ -961,7 +960,6 @@ int __dax_zero_page_range(struct block_device *bdev,
 		pgoff_t pgoff;
 		long rc, id;
 		void *kaddr;
-		pfn_t pfn;
 
 		rc = bdev_dax_pgoff(bdev, sector, PAGE_SIZE, &pgoff);
 		if (rc)
@@ -969,7 +967,7 @@ int __dax_zero_page_range(struct block_device *bdev,
 
 		id = dax_read_lock();
 		rc = dax_direct_access(dax_dev, pgoff, 1, &kaddr,
-				&pfn);
+				NULL);
 		if (rc < 0) {
 			dax_read_unlock(id);
 			return rc;
@@ -1024,7 +1022,6 @@ int __dax_zero_page_range(struct block_device *bdev,
 		ssize_t map_len;
 		pgoff_t pgoff;
 		void *kaddr;
-		pfn_t pfn;
 
 		if (fatal_signal_pending(current)) {
 			ret = -EINTR;
@@ -1036,7 +1033,7 @@ int __dax_zero_page_range(struct block_device *bdev,
 			break;
 
 		map_len = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size),
-				&kaddr, &pfn);
+				&kaddr, NULL);
 		if (map_len < 0) {
 			ret = map_len;
 			break;
-- 
1.8.3.1