linux-kernel - [PATCH 5.13 098/156] s390/traps: do not test MONITOR CALL without CONFIG

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Date:   Thu, 22 Jul 2021 18:31:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ilya Leoshkevich <iii@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 098/156] s390/traps: do not test MONITOR CALL without CONFIG_BUG

From: Ilya Leoshkevich <iii@...ux.ibm.com>

[ 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@...ux.ibm.com>
Reviewed-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/s390/kernel/traps.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 8dd23c703718..662f52eb7639 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -277,6 +277,8 @@ 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"
-- 
2.30.2