From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Date: Wed, 9 May 2012 14:27:35 +0000 (+0200)
Subject: s390: initialize backchain for ext_int_handler()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0de9db37f0dff3bda21b3650ba60a21d3fe70df2;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

s390: initialize backchain for ext_int_handler()

To allow correct stack backtraces the backchain for the external
interrupt handler is now initialized with zero like it is already
done for example by io_int_handler().

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 4e1c292fa7e3..6b5ea904e997 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -622,6 +622,7 @@ ext_skip:
 	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
 	stmg	%r8,%r9,__PT_PSW(%r11)
 	TRACE_IRQS_OFF
+	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
 	lghi	%r1,4096
 	lgr	%r2,%r11		# pass pointer to pt_regs
 	llgf	%r3,__LC_EXT_CPU_ADDR	# get cpu address + interruption code