MIPS: OCTEON: Fix FP context save.

It wasn't being saved on task switch.
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8934/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/octeon_switch.S

@@ -31,15 +31,11 @@
 	/*
 	 * check if we need to save FPU registers
 	 */
-	PTR_L	t3, TASK_THREAD_INFO(a0)
-	LONG_L	t0, TI_FLAGS(t3)
-	li	t1, _TIF_USEDFPU
-	and	t2, t0, t1
-	beqz	t2, 1f
-	nor	t1, zero, t1
-
-	and	t0, t0, t1
-	LONG_S	t0, TI_FLAGS(t3)
+	.set push
+	.set noreorder
+	beqz	a3, 1f
+	 PTR_L	t3, TASK_THREAD_INFO(a0)
+	.set pop
 
 	/*
 	 * clear saved user stack CU1 bit
@@ -57,14 +53,13 @@
 1:
 
 	/* check if we need to save COP2 registers */
-	PTR_L	t2, TASK_THREAD_INFO(a0)
-	LONG_L	t0, ST_OFF(t2)
+	LONG_L	t0, ST_OFF(t3)
 	bbit0	t0, 30, 1f
 
 	/* Disable COP2 in the stored process state */
 	li	t1, ST0_CU2
 	xor	t0, t1
-	LONG_S	t0, ST_OFF(t2)
+	LONG_S	t0, ST_OFF(t3)
 
 	/* Enable COP2 so we can save it */
 	mfc0	t0, CP0_STATUS