cpu_has_nan_legacy  532 arch/mips/include/asm/cpu-features.h #define cpu_has_nan_legacy	__isa_lt_and_opt(6, MIPS_CPU_NAN_LEGACY)
cpu_has_nan_legacy   87 arch/mips/include/asm/mach-au1x00/cpu-feature-overrides.h #define cpu_has_nan_legacy		1