commit 
54d2379c20d814ced657cbc2c4ead8d1f8389fa2 upstream.
LBDAF is not available nor necessary on 64BIT kernel. This patch
fixed the dependency for hv_blkvsc module on 64BIT kernel.
Thanks vrataj2 [vrataj2@comcast.net] for reporting this problem.
Reported-by: vrataj2 <vrataj2@comcast.net>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
 
 
 config HYPERV_BLOCK
        tristate "Microsoft Hyper-V virtual block driver"
-       depends on BLOCK && SCSI && LBDAF
+       depends on BLOCK && SCSI && (LBDAF || 64BIT)
        default HYPERV
        help
          Select this option to enable the Hyper-V virtual block driver.