Patch "MIPS: Replace add and sub instructions in relocate_kernel.S with addiu" has been added to the 4.1-stable tree

Patch "MIPS: Replace add and sub instructions in relocate_kernel.S with addiu" 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: Replace add and sub instructions in relocate_kernel.S with addiu

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-replace-add-and-sub-instructions-in-relocate_kernel.s-with-addiu.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 a4504755e7dc8d43ed2a934397032691cd03adf7 Mon Sep 17 00:00:00 2001
From: James Cowgill <James.Cowgill@imgtec.com>
Date: Wed, 17 Jun 2015 17:12:50 +0100
Subject: MIPS: Replace add and sub instructions in relocate_kernel.S with addiu

From: James Cowgill <James.Cowgill@imgtec.com>

commit a4504755e7dc8d43ed2a934397032691cd03adf7 upstream.

Fixes the assembler errors generated when compiling a MIPS R6 kernel with
CONFIG_KEXEC on, by replacing the offending add and sub instructions with
addiu instructions.

Build errors:
arch/mips/kernel/relocate_kernel.S: Assembler messages:
arch/mips/kernel/relocate_kernel.S:27: Error: invalid operands `dadd $16,$16,8'
arch/mips/kernel/relocate_kernel.S:64: Error: invalid operands `dadd $20,$20,8'
arch/mips/kernel/relocate_kernel.S:65: Error: invalid operands `dadd $18,$18,8'
arch/mips/kernel/relocate_kernel.S:66: Error: invalid operands `dsub $22,$22,1'
scripts/Makefile.build:294: recipe for target 'arch/mips/kernel/relocate_kernel.o' failed

Signed-off-by: James Cowgill <James.Cowgill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10558/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/mips/kernel/relocate_kernel.S |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/arch/mips/kernel/relocate_kernel.S
+++ b/arch/mips/kernel/relocate_kernel.S
@@ -24,7 +24,7 @@ LEAF(relocate_new_kernel)
 
 process_entry:
 	PTR_L		s2, (s0)
-	PTR_ADD		s0, s0, SZREG
+	PTR_ADDIU	s0, s0, SZREG
 
 	/*
 	 * In case of a kdump/crash kernel, the indirection page is not
@@ -61,9 +61,9 @@ copy_word:
 	/* copy page word by word */
 	REG_L		s5, (s2)
 	REG_S		s5, (s4)
-	PTR_ADD		s4, s4, SZREG
-	PTR_ADD		s2, s2, SZREG
-	LONG_SUB	s6, s6, 1
+	PTR_ADDIU	s4, s4, SZREG
+	PTR_ADDIU	s2, s2, SZREG
+	LONG_ADDIU	s6, s6, -1
 	beq		s6, zero, process_entry
 	b		copy_word
 	b		process_entry


Patches currently in stable-queue which might be from James.Cowgill@imgtec.com are

queue-4.1/mips-replace-add-and-sub-instructions-in-relocate_kernel.s-with-addiu.patch
queue-4.1/mips-unaligned-fix-build-error-on-big-endian-r6-kernels.patch