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

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Message-ID: <CAKTCnz=cDmeU6rvqpHf_oW-JjtcVSNjeSQpwzwRMo5U_g+hAwg@mail.gmail.com>
Date:   Mon, 12 Feb 2018 22:12:13 +1100
From:   Balbir Singh <bsingharora@...il.com>
To:     Vaibhav Jain <vaibhav@...ux.vnet.ibm.com>
Cc:     "open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)" 
        <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Douglas Miller <dougmill@...ux.vnet.ibm.com>,
        Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Subject: Re: [PATCH] powerpc/xmon: Dont register sysrq key when kernel param xmon=off

On Mon, Feb 12, 2018 at 7:59 PM, Vaibhav Jain
<vaibhav@...ux.vnet.ibm.com> wrote:
> 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>
> ---

Any specific issue you've run into without this patch? I presume
running xmon=off indicates we don't want xmon to take over in case of
panic/die/oops, why are we tying this to sysrq?

Balbir Singh.