linux-kernel - Re: [PATCH] sysrq: allow user trigger sysrq by upper-case character key

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Message-ID: <51385291.9060109@huawei.com>
Date:	Thu, 7 Mar 2013 16:40:49 +0800
From:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH] sysrq: allow user trigger sysrq by upper-case character
 key

On 2013/3/7 5:39, Andrew Morton wrote:
> On Wed, 6 Mar 2013 12:07:34 +0800 "zhangwei(Jovi)" <jovi.zhangwei@...wei.com> wrote:
> 
>> See the help text output of /proc/sysrq-trigger:
>>
>>    SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E)
>>    memory-full-oom-kill(F) kill-all-tasks(I) ...
>>
>> Most command is referenced by responding upper-case character,
>> this would hint user can trigger sysrq by upper-case character key,
>> but that's wrong, sysrq only accept lower-case character currently.
>>
>> It's reasonable to let user trigger sysrq by upper-case character key.
>>
>> Signed-off-by: zhnagwei(Jovi) <jovi.zhangwei@...wei.com>
>> ---
>>  drivers/tty/sysrq.c |    2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
>> index 3687f0c..a88908e 100644
>> --- a/drivers/tty/sysrq.c
>> +++ b/drivers/tty/sysrq.c
>> @@ -471,6 +471,8 @@ static int sysrq_key_table_key2index(int key)
>>  		retval = key - '0';
>>  	else if ((key >= 'a') && (key <= 'z'))
>>  		retval = key + 10 - 'a';
>> +	else if ((key >= 'A') && (key <= 'Z'))
>> +		retval = key + 10 - 'A';
>>  	else
>>  		retval = -1;
>>  	return retval;
> 
> Then fix the help message ;)
> 
> We're already using 19 of the 26 letters and this change would rule out
> future use of the 26 upper-case letters.
> 
> I doubt if anyone is hurting from the inconsistent help message, really.
It's confusing, I always try to trigger sysrq by upper-case character after read help message.

I will resend patch to change the help message instead.

Thanks.

> 



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