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dax/super: Do not request a pointer kaddr when not required 

Function __bdev_dax_supported doesn't need to get local pointer kaddr
from direct_access. Using NULL instead of having to pass in a useless
local pointer 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 15:15:46 +08:00 committed by Dave Jiang
parent 45df5d3dc0
commit e0b401e3fe
1 changed files with 1 additions and 2 deletions
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3
drivers/dax/super.c
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@ -88,7 +88,6 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
bool dax_enabled = false;
pgoff_t pgoff;
int err, id;
void *kaddr;
pfn_t pfn;
long len;
char buf[BDEVNAME_SIZE];
@ -114,7 +113,7 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
}
id = dax_read_lock();
len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);
len = dax_direct_access(dax_dev, pgoff, 1, NULL, &pfn);
dax_read_unlock(id);
put_dax(dax_dev);