MIPS: Quit using undefined behavior of ADDU in 64-bit atomic operations.
For 64-bit, we must use DADDU and DSUBU. Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1483/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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