linux-kernel - [PATCH] powerpc/xmon: Dont register sysrq key when kernel param xmon=off

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Date:   Mon, 12 Feb 2018 14:29:56 +0530
From:   Vaibhav Jain <vaibhav@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Vaibhav Jain <vaibhav@...ux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Balbir Singh <bsingharora@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Douglas Miller <dougmill@...ux.vnet.ibm.com>,
        Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Subject: [PATCH] powerpc/xmon: Dont register sysrq key when kernel param xmon=off

Presently sysrq key for xmon('x') is registered during kernel init
irrespective of the value of kernel param 'xmon'. Thus xmon is enabled
even if 'xmon=off' is passed on the kernel command line.

This minor patch updates setup_xmon_sysrq() to register
'sysrq_xmon_op' only when variable 'xmon_on' is set.

Signed-off-by: Vaibhav Jain <vaibhav@...ux.vnet.ibm.com>
---
 arch/powerpc/xmon/xmon.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 82e1a3ee6e0f..3b995474b102 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3642,8 +3642,7 @@ static struct sysrq_key_op sysrq_xmon_op = {
 
 static int __init setup_xmon_sysrq(void)
 {
-	register_sysrq_key('x', &sysrq_xmon_op);
-	return 0;
+	return xmon_on ? register_sysrq_key('x', &sysrq_xmon_op) : 0;
 }
 device_initcall(setup_xmon_sysrq);
 #endif /* CONFIG_MAGIC_SYSRQ */
-- 
2.14.3