From 4e62d458850069c9f05e03f99be1a817967e201f Mon Sep 17 00:00:00 2001
From: Vasily Gorbik <gor@linux.ibm.com>
Date: Fri, 14 Sep 2018 17:35:46 +0200
Subject: s390: clean up stacks setup

Replace hard coded stack frame overhead values with STACK_FRAME_OVERHEAD
definition. Avoid unnecessary arithmetic instructions.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
 arch/s390/purgatory/head.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'arch/s390/purgatory')

diff --git a/arch/s390/purgatory/head.S b/arch/s390/purgatory/head.S
index 2e3707b12edd..5a10ce34b95d 100644
--- a/arch/s390/purgatory/head.S
+++ b/arch/s390/purgatory/head.S
@@ -11,6 +11,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/page.h>
 #include <asm/sigp.h>
+#include <asm/ptrace.h>
 
 /* The purgatory is the code running between two kernels. It's main purpose
  * is to verify that the next kernel was not corrupted after load and to
@@ -88,8 +89,7 @@ ENTRY(purgatory_start)
 .base_crash:
 
 	/* Setup stack */
-	larl	%r15,purgatory_end
-	aghi	%r15,-160
+	larl	%r15,purgatory_end-STACK_FRAME_OVERHEAD
 
 	/* If the next kernel is KEXEC_TYPE_CRASH the purgatory is called
 	 * directly with a flag passed in %r2 whether the purgatory shall do
-- 
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