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Commit e0b401e3 authored by Huaisheng Ye's avatar Huaisheng Ye Committed by Dave Jiang
Browse files

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: default avatarHuaisheng Ye <yehs1@lenovo.com>
Reviewed-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: default avatarDave Jiang <dave.jiang@intel.com>
parent 45df5d3d

drivers/dax/super.c

+1 −2
Original line number Diff line number Diff line
@@ -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);