Patch "ARCv2: save r30 on kernel entry as gcc uses it for code-gen" has been added to the 4.4-stable tree

Patch "ARCv2: save r30 on kernel entry as gcc uses it for code-gen" has been added to the 4.4-stable tree

[gregkh]

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

    ARCv2: save r30 on kernel entry as gcc uses it for code-gen

to the 4.4-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:
     arcv2-save-r30-on-kernel-entry-as-gcc-uses-it-for-code-gen.patch
and it can be found in the queue-4.4 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 ecd43afdbe72017aefe48080631eb625e177ef4d Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgupta@synopsys.com>
Date: Sun, 8 Jan 2017 19:45:48 -0800
Subject: ARCv2: save r30 on kernel entry as gcc uses it for code-gen

From: Vineet Gupta <vgupta@synopsys.com>

commit ecd43afdbe72017aefe48080631eb625e177ef4d upstream.

This is not exposed to userspace debugers yet, which can be done
independently as a seperate patch !

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arc/include/asm/entry-arcv2.h |    2 ++
 arch/arc/include/asm/ptrace.h      |    2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/arch/arc/include/asm/entry-arcv2.h
+++ b/arch/arc/include/asm/entry-arcv2.h
@@ -16,6 +16,7 @@
 	;
 	; Now manually save: r12, sp, fp, gp, r25
 
+	PUSH	r30
 	PUSH	r12
 
 	; Saving pt_regs->sp correctly requires some extra work due to the way
@@ -72,6 +73,7 @@
 	POPAX	AUX_USER_SP
 1:
 	POP	r12
+	POP	r30
 
 .endm
 
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -84,7 +84,7 @@ struct pt_regs {
 	unsigned long fp;
 	unsigned long sp;	/* user/kernel sp depending on where we came from  */
 
-	unsigned long r12;
+	unsigned long r12, r30;
 
 	/*------- Below list auto saved by h/w -----------*/
 	unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;


Patches currently in stable-queue which might be from vgupta@synopsys.com are

queue-4.4/arcv2-save-r30-on-kernel-entry-as-gcc-uses-it-for-code-gen.patch