[PATCH 4/5] filesystem-dax: Do not request a pointer kaddr when not required

Huaisheng Ye
2018-07-24T08:45:09Z

Some functions within fs/dax don't need to get pointer kaddr from
direct_access. In support of allowing memmap initialization to run
in the background elide requests for pointer kaddr when not required.

Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
---
fs/dax.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index aaec72de..abdb9e2 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -870,7 +870,6 @@ 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;

@@ -879,7 +878,7 @@ 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;
--
1.8.3.1