Patch "MIPS: Require O32 FP64 support for MIPS64 with O32 compat" has been added to the 4.1-stable tree

Patch "MIPS: Require O32 FP64 support for MIPS64 with O32 compat" has been added to the 4.1-stable tree

[gregkh]

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

    MIPS: Require O32 FP64 support for MIPS64 with O32 compat

to the 4.1-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-require-o32-fp64-support-for-mips64-with-o32-compat.patch
and it can be found in the queue-4.1 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 4e9d324d4288b082497c30bc55b8ad13acc7cf01 Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@imgtec.com>
Date: Fri, 10 Jul 2015 16:00:24 +0100
Subject: MIPS: Require O32 FP64 support for MIPS64 with O32 compat

From: Paul Burton <paul.burton@imgtec.com>

commit 4e9d324d4288b082497c30bc55b8ad13acc7cf01 upstream.

MIPS32r6 code requires FP64 (ie. FR=1) support. Building a kernel with
support for MIPS32r6 binaries but without support for O32 with FP64 is
therefore a problem which can lead to incorrectly executed userland.

CONFIG_MIPS_O32_FP64_SUPPORT is already selected when the kernel is
configured for MIPS32r6, but not when the kernel is configured for
MIPS64r6 with O32 compat support. Select CONFIG_MIPS_O32_FP64_SUPPORT in
such configurations to prevent building kernels which execute MIPS32r6
userland incorrectly.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Matthew Fortune <matthew.fortune@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10674/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/mips/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1417,6 +1417,7 @@ config CPU_MIPS64_R6
 	select CPU_SUPPORTS_HIGHMEM
 	select CPU_SUPPORTS_MSA
 	select GENERIC_CSUM
+	select MIPS_O32_FP64_SUPPORT if MIPS32_O32
 	help
 	  Choose this option to build a kernel for release 6 or later of the
 	  MIPS64 architecture.  New MIPS processors, starting with the Warrior


Patches currently in stable-queue which might be from paul.burton@imgtec.com are

queue-4.1/mips-kernel-cps-vec-replace-mips32r2-isa-level-with-mips64r2.patch
queue-4.1/mips-kernel-cps-vec-use-ta0-ta3-pseudo-registers-for-64-bit.patch
queue-4.1/revert-mips-kconfig-disable-smp-cps-for-64-bit.patch
queue-4.1/mips-require-o32-fp64-support-for-mips64-with-o32-compat.patch
queue-4.1/mips-fpu.h-allow-64-bit-fpu-on-a-64-bit-mips-r6-cpu.patch
queue-4.1/mips-kernel-cps-vec-replace-la-macro-with-ptr_la.patch
queue-4.1/mips-kernel-smp-cps-fix-64-bit-compatibility-errors-due-to-pointer-casting.patch
queue-4.1/mips-kernel-cps-vec-replace-kseg0-with-ckseg0.patch
queue-4.1/mips-cps-vec-use-macros-for-various-arithmetics-and-memory-operations.patch