1 files changed, 24 insertions, 12 deletions

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index eb76434828e8..85bff5d513e5 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -82,6 +82,30 @@ void flush_thread(void)
 {
 }
 
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+        /*
+         * Save any process state which is live in hardware registers to the
+         * parent context prior to duplication. This prevents the new child
+         * state becoming stale if the parent is preempted before copy_thread()
+         * gets a chance to save the parent's live hardware registers to the
+         * child context.
+         */
+        preempt_disable();
+
+        if (is_msa_enabled())
+                save_msa(current);
+        else if (is_fpu_owner())
+                _save_fp(current);
+
+        save_dsp(current);
+
+        preempt_enable();
+
+        *dst = *src;
+        return 0;
+}
+
 int copy_thread(unsigned long clone_flags, unsigned long usp,
         unsigned long arg, struct task_struct *p)
 {
@@ -92,18 +116,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 
         childksp = (unsigned long)task_stack_page(p) + THREAD_SIZE - 32;
 
-        preempt_disable();
-
-        if (is_msa_enabled())
-                save_msa(p);
-        else if (is_fpu_owner())
-                save_fp(p);
-
-        if (cpu_has_dsp)
-                save_dsp(p);
-
-        preempt_enable();
-
         /* set up new TSS. */
         childregs = (struct pt_regs *) childksp - 1;
         /*  Put the stack after the struct pt_regs.  */