This is a note to let you know that I've just added the patch titled
MIPS: asm: pgtable: Add c0 hazards on HTW start/stop sequences
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-asm-pgtable-add-c0-hazards-on-htw-start-stop-sequences.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 461d1597ffad7a826f8aaa63ab0727c37b632e34 Mon Sep 17 00:00:00 2001
From: Markos Chandras <markos.chandras@xxxxxxxxxx>
Date: Mon, 26 Jan 2015 09:40:34 +0000
Subject: MIPS: asm: pgtable: Add c0 hazards on HTW start/stop sequences
From: Markos Chandras <markos.chandras@xxxxxxxxxx>
commit 461d1597ffad7a826f8aaa63ab0727c37b632e34 upstream.
When we use htw_{start,stop}() outside of htw_reset(), we need
to ensure that c0 changes have been propagated properly before
we attempt to continue with subsequence memory operations.
Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/9114/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/include/asm/pgtable.h | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -99,16 +99,20 @@ extern void paging_init(void);
#define htw_stop() \
do { \
- if (cpu_has_htw) \
+ if (cpu_has_htw) { \
write_c0_pwctl(read_c0_pwctl() & \
~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
+ back_to_back_c0_hazard(); \
+ } \
} while(0)
#define htw_start() \
do { \
- if (cpu_has_htw) \
+ if (cpu_has_htw) { \
write_c0_pwctl(read_c0_pwctl() | \
(1 << MIPS_PWCTL_PWEN_SHIFT)); \
+ back_to_back_c0_hazard(); \
+ } \
} while(0)
@@ -116,9 +120,7 @@ do { \
do { \
if (cpu_has_htw) { \
htw_stop(); \
- back_to_back_c0_hazard(); \
htw_start(); \
- back_to_back_c0_hazard(); \
} \
} while(0)
Patches currently in stable-queue which might be from markos.chandras@xxxxxxxxxx are
queue-3.19/mips-kernel-cps-vec-replace-addi-with-addiu.patch
queue-3.19/kvm-mips-disable-htw-while-in-guest.patch
queue-3.19/mips-asm-pgtable-prevent-htw-race-when-updating-ptes.patch
queue-3.19/mips-asm-pgtable-add-c0-hazards-on-htw-start-stop-sequences.patch
queue-3.19/mips-asm-asmmacro-replace-add-instructions-with-addu.patch
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