This is a note to let you know that I've just added the patch titled
MIPS: head: Reorder instructions missing a delay slot
to the 4.9-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-head-reorder-instructions-missing-a-delay-slot.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 25d8b92e0af75d72ce8b99e63e5a449cc0888efa Mon Sep 17 00:00:00 2001
From: Karl Beldan <karl.beldan@xxxxxxxxx>
Date: Tue, 27 Jun 2017 19:22:16 +0000
Subject: MIPS: head: Reorder instructions missing a delay slot
From: Karl Beldan <karl.beldan@xxxxxxxxx>
commit 25d8b92e0af75d72ce8b99e63e5a449cc0888efa upstream.
In this sequence the 'move' is assumed in the delay slot of the 'beq',
but head.S is in reorder mode and the former gets pushed one 'nop'
farther by the assembler.
The corrected behavior made booting with an UHI supplied dtb erratic.
Fixes: 15f37e158892 ("MIPS: store the appended dtb address in a variable")
Signed-off-by: Karl Beldan <karl.beldan+oss@xxxxxxxxx>
Reviewed-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Jonas Gorski <jogo@xxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/16614/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/head.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -106,8 +106,8 @@ NESTED(kernel_entry, 16, sp) # kernel
beq t0, t1, dtb_found
#endif
li t1, -2
- beq a0, t1, dtb_found
move t2, a1
+ beq a0, t1, dtb_found
li t2, 0
dtb_found:
Patches currently in stable-queue which might be from karl.beldan@xxxxxxxxx are
queue-4.9/mips-head-reorder-instructions-missing-a-delay-slot.patch