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Subject[3.19.y-ckt stable] Patch "MIPS: CPS: Don't include MT code in non-MT kernels." has been added to staging queue
Date
This is a note to let you know that I have just added a patch titled

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

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree
which can be found at:

http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt10.

If you, or anyone else, feels it should not be added to this tree, please
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

From 1e3159d27000240307fee68bf78f6d1f91514ae2 Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@imgtec.com>
Date: Wed, 5 Aug 2015 15:42:37 -0700
Subject: MIPS: CPS: Don't include MT code in non-MT kernels.

commit a5b0f6db0e6cf6224e50f6585e9c8f0c2d38a8f8 upstream.

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: 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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
arch/mips/kernel/cps-vec.S | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/mips/kernel/cps-vec.S b/arch/mips/kernel/cps-vec.S
index 24b8c0b6..d729a5e 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 t6, 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
--
1.9.1


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