This is a note to let you know that I've just added the patch titled
MIPS: CPS: Don't include MT code in non-MT kernels.
to the 4.2-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-cps-don-t-include-mt-code-in-non-mt-kernels.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a5b0f6db0e6cf6224e50f6585e9c8f0c2d38a8f8 Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@xxxxxxxxxx>
Date: Wed, 5 Aug 2015 15:42:37 -0700
Subject: MIPS: CPS: Don't include MT code in non-MT kernels.
From: Paul Burton <paul.burton@xxxxxxxxxx>
commit a5b0f6db0e6cf6224e50f6585e9c8f0c2d38a8f8 upstream.
The MT-specific code in mips_cps_boot_vpes can safely be omitted from
kernels which don't support MT, with the default VPE==0 case being used
as it would be after the has_mt (Config3.MT) check failed at runtime.
Discarding the code entirely will save us a few bytes & allow cleaner
handling of MT ASE instructions by later patches.
Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Markos Chandras <markos.chandras@xxxxxxxxxx>
Cc: James Hogan <james.hogan@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/10866/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/cps-vec.S | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/mips/kernel/cps-vec.S
+++ b/arch/mips/kernel/cps-vec.S
@@ -311,6 +311,7 @@ LEAF(mips_cps_boot_vpes)
/* Calculate this VPEs ID. If the core doesn't support MT use 0 */
li t9, 0
+#ifdef CONFIG_MIPS_MT
has_mt ta2, 1f
/* Find the number of VPEs present in the core */
@@ -330,6 +331,7 @@ LEAF(mips_cps_boot_vpes)
/* Retrieve the VPE ID from EBase.CPUNum */
mfc0 t9, $15, 1
and t9, t9, t1
+#endif
1: /* Calculate a pointer to this VPEs struct vpe_boot_config */
li t1, VPEBOOTCFG_SIZE
Patches currently in stable-queue which might be from paul.burton@xxxxxxxxxx are
queue-4.2/mips-cps-don-t-include-mt-code-in-non-mt-kernels.patch
queue-4.2/mips-cps-ifdef-on-config_mips_mt_smp-rather-than-config_mips_mt.patch
queue-4.2/mips-cps-stop-dangling-delay-slot-from-has_mt.patch
--
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