MIPS: Loongson64: Test register availability before use
commit c04366b1 upstream. Some global register address variable may be missing on specific CPU type, test them before use them. Cc: stable@vger.kernel.org Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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