This is a note to let you know that I've just added the patch titled

MIPS: CPS: Fix MIPS_ISA_LEVEL_RAW fallout

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: mips-cps-fix-mips_isa_level_raw-fallout.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 8dbc1864b74f5dea5a3f7c30ca8fd358a675132f Mon Sep 17 00:00:00 2001

From: James Hogan jhogan@kernel.org Date: Fri, 2 Feb 2018 14:36:40 +0000 Subject: MIPS: CPS: Fix MIPS_ISA_LEVEL_RAW fallout

From: James Hogan jhogan@kernel.org

commit 8dbc1864b74f5dea5a3f7c30ca8fd358a675132f upstream.

Commit 17278a91e04f ("MIPS: CPS: Fix r1 .set mt assembler warning") added .set MIPS_ISA_LEVEL_RAW to silence warnings about .set mt on r1, however this can result in a MOVE being encoded as a 64-bit DADDU instruction on certain version of binutils (e.g. 2.22), and reserved instruction exceptions at runtime on 32-bit hardware.

Reduce the sizes of the push/pop sections to include only instructions that are part of the MT ASE or which won't convert to 64-bit instructions after .set mips64r2/mips64r6.

Reported-by: Greg Ungerer gerg@linux-m68k.org Fixes: 17278a91e04f ("MIPS: CPS: Fix r1 .set mt assembler warning") Signed-off-by: James Hogan jhogan@kernel.org Cc: Ralf Baechle ralf@linux-mips.org Cc: Paul Burton paul.burton@mips.com Cc: linux-mips@linux-mips.org Cc: stable@vger.kernel.org # 4.15 Tested-by: Greg Ungerer gerg@linux-m68k.org Patchwork: https://patchwork.linux-mips.org/patch/18578/ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- arch/mips/kernel/cps-vec.S | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-)

--- a/arch/mips/kernel/cps-vec.S +++ b/arch/mips/kernel/cps-vec.S @@ -388,15 +388,16 @@ LEAF(mips_cps_boot_vpes)

#elif defined(CONFIG_MIPS_MT)

- .set push - .set MIPS_ISA_LEVEL_RAW - .set mt - /* If the core doesn't support MT then return */ has_mt t0, 5f

/* Enter VPE configuration state */ + .set push + .set MIPS_ISA_LEVEL_RAW + .set mt dvpe + .set pop + PTR_LA t1, 1f jr.hb t1 nop @@ -422,6 +423,10 @@ LEAF(mips_cps_boot_vpes) mtc0 t0, CP0_VPECONTROL ehb

+ .set push + .set MIPS_ISA_LEVEL_RAW + .set mt + /* Skip the VPE if its TC is not halted */ mftc0 t0, CP0_TCHALT beqz t0, 2f @@ -495,6 +500,8 @@ LEAF(mips_cps_boot_vpes) ehb evpe

+ .set pop + /* Check whether this VPE is meant to be running */ li t0, 1 sll t0, t0, a1 @@ -509,7 +516,7 @@ LEAF(mips_cps_boot_vpes) 1: jr.hb t0 nop

-2: .set pop +2:

#endif /* CONFIG_MIPS_MT_SMP */

Patches currently in stable-queue which might be from jhogan@kernel.org are

queue-4.15/mips-fix-typo-big_endian-to-cpu_big_endian.patch queue-4.15/mips-fix-incorrect-mem-x-y-handling.patch queue-4.15/mips-cps-fix-mips_isa_level_raw-fallout.patch