This is a note to let you know that I have just added a patch titled
MIPS: CPS: Stop dangling delay slot from has_mt.
to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue
This patch is scheduled to be released in version 3.16.7-ckt19.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From ecab244e2724ec7bed31a597d71e1daa6590f53e Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@xxxxxxxxxx>
Date: Wed, 5 Aug 2015 15:42:36 -0700
Subject: MIPS: CPS: Stop dangling delay slot from has_mt.
commit 1e5fb282f8eda889776ee83f9214d5df9edaa26d upstream.
The has_mt macro ended with a branch, leaving its callers with a delay
slot that would be executed if Config3.MT is not set. However it would
not be executed if Config3 (or earlier Config registers) don't exist
which makes it somewhat inconsistent at best. Fill the delay slot in the
macro & fix the mips_cps_boot_vpes caller appropriately.
Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Markos Chandras <markos.chandras@xxxxxxxxxx>
Cc: James Hogan <james.hogan@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/10865/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
arch/mips/kernel/cps-vec.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/mips/kernel/cps-vec.S b/arch/mips/kernel/cps-vec.S
index 3b3fb8924628..5652af5786ef 100644
--- a/arch/mips/kernel/cps-vec.S
+++ b/arch/mips/kernel/cps-vec.S
@@ -39,6 +39,7 @@
mfc0 \dest, CP0_CONFIG, 3
andi \dest, \dest, MIPS_CONF3_MT
beqz \dest, \nomt
+ nop
.endm
.section .text.cps-vec
@@ -226,7 +227,6 @@ LEAF(mips_cps_core_init)
#ifdef CONFIG_MIPS_MT
/* Check that the core implements the MT ASE */
has_mt t0, 3f
- nop
.set push
.set mt
@@ -309,8 +309,8 @@ LEAF(mips_cps_boot_vpes)
addu t0, t0, t1
/* Calculate this VPEs ID. If the core doesn't support MT use 0 */
+ li t9, 0
has_mt t6, 1f
- li t9, 0
/* Find the number of VPEs present in the core */
mfc0 t1, CP0_MVPCONF0
