MIPS: Octeon: Opt-out 4k_cache feature

Octeon has a different cache interface with traditional R4K one,
just opt-out this flag for octeon to avoid run R4K cache initialization
code accidentally.

Also remove ISA level assumption for 4k cache.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/include/asm/cpu-features.h

@@ -118,7 +118,7 @@
 #define cpu_has_3k_cache	__isa_lt_and_opt(1, MIPS_CPU_3K_CACHE)
 #endif
 #ifndef cpu_has_4k_cache
-#define cpu_has_4k_cache	__isa_ge_or_opt(1, MIPS_CPU_4K_CACHE)
+#define cpu_has_4k_cache	__opt(MIPS_CPU_4K_CACHE)
 #endif
 #ifndef cpu_has_octeon_cache
 #define cpu_has_octeon_cache	0

arch/mips/kernel/cpu-probe.c

@@ -1602,6 +1602,8 @@ static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
 {
 	decode_configs(c);
+	/* Octeon has different cache interface */
+	c->options &= ~MIPS_CPU_4K_CACHE;
 	switch (c->processor_id & PRID_IMP_MASK) {
 	case PRID_IMP_CAVIUM_CN38XX:
 	case PRID_IMP_CAVIUM_CN31XX: