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-rw-r--r--arch/mips/kernel/traps.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 6336fe8008ec..e9902d89dc0a 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -758,6 +758,36 @@ asmlinkage void do_cpu(struct pt_regs *regs)
&current->thread.fpu.soft);
if (sig)
force_sig(sig, current);
+#ifdef CONFIG_MIPS_MT_FPAFF
+ else {
+ /*
+ * MIPS MT processors may have fewer FPU contexts
+ * than CPU threads. If we've emulated more than
+ * some threshold number of instructions, force
+ * migration to a "CPU" that has FP support.
+ */
+ if(mt_fpemul_threshold > 0
+ && ((current->thread.emulated_fp++
+ > mt_fpemul_threshold))) {
+ /*
+ * If there's no FPU present, or if the
+ * application has already restricted
+ * the allowed set to exclude any CPUs
+ * with FPUs, we'll skip the procedure.
+ */
+ if (cpus_intersects(current->cpus_allowed,
+ mt_fpu_cpumask)) {
+ cpumask_t tmask;
+
+ cpus_and(tmask,
+ current->thread.user_cpus_allowed,
+ mt_fpu_cpumask);
+ set_cpus_allowed(current, tmask);
+ current->thread.mflags |= MF_FPUBOUND;
+ }
+ }
+ }
+#endif /* CONFIG_MIPS_MT_FPAFF */
}
return;