From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: Fri, 2 Jul 2021 13:54:55 +0000 (+0200)
Subject: s390/traps: do not test MONITOR CALL without CONFIG_BUG
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=be10fff3a4612c21e92405bce52132bad39c093a;p=linux-block.git

s390/traps: do not test MONITOR CALL without CONFIG_BUG

[ Upstream commit b8e9cc20b808e26329090c19ff80b7f5098e98ff ]

tinyconfig fails to boot, because without CONFIG_BUG report_bug()
always returns BUG_TRAP_TYPE_BUG, which causes mc 0,0 in
test_monitor_call() to panic. Fix by skipping the test without
CONFIG_BUG.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 8d1e8a1a97df..16934fa19069 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -272,6 +272,8 @@ static void __init test_monitor_call(void)
 {
 	int val = 1;
 
+	if (!IS_ENABLED(CONFIG_BUG))
+		return;
 	asm volatile(
 		"	mc	0,0\n"
 		"0:	xgr	%0,%0\n"