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CONFIG_MIPS_MT_SMTC_IM_BACKSTOP: Use per-TC register bits as backstop for inhibited IM bits

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The Linux kernel configuration item CONFIG_MIPS_MT_SMTC_IM_BACKSTOP:

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To support multiple TC microthreads acting as "CPUs" within a VPE, VPE-wide interrupt mask bits must be specially manipulated during interrupt handling. To support legacy drivers and interrupt controller management code, SMTC has a "backstop" to track and if necessary restore the interrupt mask. This has some performance impact on interrupt service overhead.

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