[MIPS] Fix scheduling latency issue on 24K, 34K and 74K cores

[~andy/linux] / arch / mips / kernel / cpu-probe.c

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 0fc90ba16ae1594d5ad7b9ba2dba771b954f1e05..b12eeee0e9748f841d85de87dfe2f7a7c3503d69 100644 (file)
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -137,13 +137,24 @@ static inline void check_wait(void)
        case CPU_4KEC:
        case CPU_4KSC:
        case CPU_5KC:
-       case CPU_24K:
        case CPU_25KF:
+       case CPU_PR4450:
+               cpu_wait = r4k_wait;
+               break;
+
+       case CPU_24K:
        case CPU_34K:
+               cpu_wait = r4k_wait;
+               if (read_c0_config7() & MIPS_CONF7_WII)
+                       cpu_wait = r4k_wait_irqoff;
+               break;
+
        case CPU_74K:
-       case CPU_PR4450:
                cpu_wait = r4k_wait;
+               if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
+                       cpu_wait = r4k_wait_irqoff;
                break;
+
        case CPU_TX49XX:
                cpu_wait = r4k_wait_irqoff;
                break;