Finds the first set bit in a 64 bit word. This is required in order
to fix a bug in GFS2, but I think it should be a generic function
in case of future users.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>
Reviewed-by: NChristoph Lameter <cl@linux.com>
Reviewed-by: NWilly Tarreau <w@1wt.eu>