linux-kernel - [4.2.y-ckt stable] Patch "MIPS: CPS: drop .set mips64r2 directives" has been added to the 4.2.y-ckt tree

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Date:	Fri, 15 Jan 2016 15:57:40 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	Paul Burton <paul.burton@...tec.com>
Cc:	Markos Chandras <markos.chandras@...tec.com>,
	James Hogan <james.hogan@...tec.com>,
	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	Kamal Mostafa <kamal@...onical.com>,
	kernel-team@...ts.ubuntu.com
Subject: [4.2.y-ckt stable] Patch "MIPS: CPS: drop .set mips64r2 directives" has been added to the 4.2.y-ckt tree

This is a note to let you know that I have just added a patch titled

    MIPS: CPS: drop .set mips64r2 directives

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt2.

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

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From d907471a21d65bbeae4873dbabdc169eb858acc7 Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@...tec.com>
Date: Wed, 5 Aug 2015 15:42:40 -0700
Subject: MIPS: CPS: drop .set mips64r2 directives

commit f3575e230cf8537951ebe3cc19974c5db2ff4f1c upstream.

Commit 977e043d5ea1 ("MIPS: kernel: cps-vec: Replace mips32r2 ISA level
with mips64r2") leads to .set mips64r2 directives being present in 32
bit (ie. CONFIG_32BIT=y) kernels. This is incorrect & leads to MIPS64
instructions being emitted by the assembler when expanding
pseudo-instructions. For example the "move" instruction can legitimately
be expanded to a "daddu". This causes problems when the kernel is run on
a MIPS32 CPU, as CONFIG_32BIT kernels of course often are...

Fix this by dropping the .set <ISA> directives entirely now that Kconfig
should be ensuring that kernels including this code are built with a
suitable -march= compiler flag.

Signed-off-by: Paul Burton <paul.burton@...tec.com>
Cc: Markos Chandras <markos.chandras@...tec.com>
Cc: James Hogan <james.hogan@...tec.com>
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10869/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/mips/kernel/cps-vec.S | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/mips/kernel/cps-vec.S b/arch/mips/kernel/cps-vec.S
index 209ded1..763d8b7 100644
--- a/arch/mips/kernel/cps-vec.S
+++ b/arch/mips/kernel/cps-vec.S
@@ -229,7 +229,6 @@ LEAF(mips_cps_core_init)
 	has_mt	t0, 3f

 	.set	push
-	.set	mips64r2
 	.set	mt

 	/* Only allow 1 TC per VPE to execute... */
@@ -348,7 +347,6 @@ LEAF(mips_cps_boot_vpes)
 	 nop

 	.set	push
-	.set	mips64r2
 	.set	mt

 1:	/* Enter VPE configuration state */
--
1.9.1