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filesystem-dax: Do not request kaddr and pfn when not required 

Some functions within fs/dax don't need to get local pointer kaddr
or variable pfn from direct_access. Using NULL instead of having to
pass in useless pointer or variable that caller then just throw away.

Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Huaisheng Ye 2018-07-30 15:15:48 +08:00 committed by Dave Jiang
parent f742267ae9
commit 86ed913b0e
1 changed files with 4 additions and 9 deletions
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13
fs/dax.c
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@ -647,7 +647,6 @@ 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;
@ -656,7 +655,7 @@ 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;
@ -967,7 +966,6 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
{
const sector_t sector = dax_iomap_sector(iomap, pos);
pgoff_t pgoff;
void *kaddr;
int id, rc;
long length;
@ -976,7 +974,7 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
return rc;
id = dax_read_lock();
length = dax_direct_access(iomap->dax_dev, pgoff, PHYS_PFN(size),
&kaddr, pfnp);
NULL, pfnp);
if (length < 0) {
rc = length;
goto out;
@ -1052,15 +1050,13 @@ 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)
return rc;
id = dax_read_lock();
rc = dax_direct_access(dax_dev, pgoff, 1, &kaddr,
&pfn);
rc = dax_direct_access(dax_dev, pgoff, 1, &kaddr, NULL);
if (rc < 0) {
dax_read_unlock(id);
return rc;
@ -1116,7 +1112,6 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
ssize_t map_len;
pgoff_t pgoff;
void *kaddr;
pfn_t pfn;
if (fatal_signal_pending(current)) {
ret = -EINTR;
@ -1128,7 +1123,7 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
break;
map_len = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size),
&kaddr, &pfn);
&kaddr, NULL);
if (map_len < 0) {
ret = map_len;
break;