This is a note to let you know that I've just added the patch titled
MIPS: asm: asmmacro: Replace "add" instructions with "addu"
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-asmmacro-replace-add-instructions-with-addu.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 98a833c1fa4de0695830f77b2d13fd86693da298 Mon Sep 17 00:00:00 2001
From: Markos Chandras <markos.chandras@xxxxxxxxxx>
Date: Wed, 5 Nov 2014 14:17:52 +0000
Subject: MIPS: asm: asmmacro: Replace "add" instructions with "addu"
From: Markos Chandras <markos.chandras@xxxxxxxxxx>
commit 98a833c1fa4de0695830f77b2d13fd86693da298 upstream.
The "add" instruction is actually a macro in binutils and depending on
the size of the immediate it can expand to an "addi" instruction.
However, the "addi" instruction traps on overflows which is not
something we want on address calculation.
Link: http://www.linux-mips.org/archives/linux-mips/2015-01/msg00121.html
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx>
Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/include/asm/asmmacro.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/mips/include/asm/asmmacro.h
+++ b/arch/mips/include/asm/asmmacro.h
@@ -304,7 +304,7 @@
.set push
.set noat
SET_HARDFLOAT
- add $1, \base, \off
+ addu $1, \base, \off
.word LDD_MSA_INSN | (\wd << 6)
.set pop
.endm
@@ -313,7 +313,7 @@
.set push
.set noat
SET_HARDFLOAT
- add $1, \base, \off
+ addu $1, \base, \off
.word STD_MSA_INSN | (\wd << 6)
.set pop
.endm
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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