MIPS: CPS: Don't include MT code in non-MT kernels.

The MT-specific code in mips_cps_boot_vpes can safely be omitted from
kernels which don't support MT, with the default VPE==0 case being used
as it would be after the has_mt (Config3.MT) check failed at runtime.
Discarding the code entirely will save us a few bytes & allow cleaner
handling of MT ASE instructions by later patches.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: <stable@vger.kernel.org> # 3.16+
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10866/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/mips/kernel/cps-vec.S b/arch/mips/kernel/cps-vec.S
index fa159aab252c..57642f56dffb 100644
--- a/arch/mips/kernel/cps-vec.S
+++ b/arch/mips/kernel/cps-vec.S
@@ -311,6 +311,7 @@ LEAF(mips_cps_boot_vpes)
 
         /* Calculate this VPEs ID. If the core doesn't support MT use 0 */
         li      t9, 0
+#ifdef CONFIG_MIPS_MT
         has_mt  ta2, 1f
 
         /* Find the number of VPEs present in the core */
@@ -330,6 +331,7 @@ LEAF(mips_cps_boot_vpes)
         /* Retrieve the VPE ID from EBase.CPUNum */
         mfc0    t9, $15, 1
         and     t9, t9, t1
+#endif
 
 1:      /* Calculate a pointer to this VPEs struct vpe_boot_config */
         li      t1, VPEBOOTCFG_SIZE