[MIPS] MT: Improved multithreading support.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index f838b36..f3106d0 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -248,10 +248,20 @@
break;
case FPC_EIR: { /* implementation / version register */
unsigned int flags;
+#ifdef CONFIG_MIPS_MT_SMTC
+ unsigned int irqflags;
+ unsigned int mtflags;
+#endif /* CONFIG_MIPS_MT_SMTC */
if (!cpu_has_fpu)
break;
+#ifdef CONFIG_MIPS_MT_SMTC
+ /* Read-modify-write of Status must be atomic */
+ local_irq_save(irqflags);
+ mtflags = dmt();
+#endif /* CONFIG_MIPS_MT_SMTC */
+
preempt_disable();
if (cpu_has_mipsmt) {
unsigned int vpflags = dvpe();
@@ -266,6 +276,10 @@
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
write_c0_status(flags);
}
+#ifdef CONFIG_MIPS_MT_SMTC
+ emt(mtflags);
+ local_irq_restore(irqflags);
+#endif /* CONFIG_MIPS_MT_SMTC */
preempt_enable();
break;
}