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There are several places which open code comparing PHY IDs. Provide a couple of helpers to assist with this, using a slightly simpler test than the original: - phy_id_compare() compares two arbitary PHY IDs and a mask of the significant bits in the ID. - phydev_id_compare() compares the bound phydev with the specified PHY ID, using the bound driver's mask. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Simon Horman <simon.horman@corigine.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>