From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 5 Jan 2015 09:10:14 +0000 (+0100)
Subject: s390/sclp: sign extend return value of _sclp_print_early()
X-Git-Tag: v4.0-rc1~117^2~33
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a7e75d434b53b45ae60779903904d4fbdbd145a5;p=karo-tx-linux.git

s390/sclp: sign extend return value of _sclp_print_early()

_sclp_print_early() has a return value, but misses to sign extend it
if called from 64 bit code.
This is not really a bug, since currently no caller cares what the
return value is.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/kernel/sclp.S b/arch/s390/kernel/sclp.S
index a41f2c99dcc8..7e77e03378f3 100644
--- a/arch/s390/kernel/sclp.S
+++ b/arch/s390/kernel/sclp.S
@@ -294,7 +294,8 @@ ENTRY(_sclp_print_early)
 #ifdef CONFIG_64BIT
 	tm	LC_AR_MODE_ID,1
 	jno	.Lesa3
-	lmh	%r6,%r15,96(%r15)		# store upper register halves
+	lgfr	%r2,%r2				# sign extend return value
+	lmh	%r6,%r15,96(%r15)		# restore upper register halves
 	ahi	%r15,80
 .Lesa3:
 #endif