linux-kernel - Re: [PATCH 2.6.23] SysRq: print hotkey info while pressing undef key

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Message-ID: <jewstnhwuu.fsf@sykes.suse.de>
Date:	Tue, 16 Oct 2007 18:01:45 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Yi Yang <yang.y.yi@...il.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org,
	mj@...ey.karlin.mff.cuni.cz, pavel@...ey.karlin.mff.cuni.cz,
	crutcher+kernel@...astacks.com
Subject: Re: [PATCH 2.6.23] SysRq: print hotkey info while pressing undef key

Yi Yang <yang.y.yi@...il.com> writes:

> For SysRq, we just can get hot key list from Documentation/sysrq.txt
> , but in the most of cases, the user can't access it by hand on
> using SysRq to debug, so it is better for SysRq to provide an online
> help for the users.
>
> SysRq has already provided a similiar help before this patch, but it
> is not so definite that the user doesn't know what happened and how
> to do on pressing an undefined hot key.
>
> In addition, that funtion has a big loop with another big loop
> embedded which is very inefficient, it is intended to skip some hot
> key help info for such a function as "Changing Loglevel", just print
> a help info for this, that is very unnecessary. In fact, the key '0'
>  - '8' have different results the user should know.
>
> This patch add this online help function, it'll print thw whole hot
> key list and corresponding function descriptions, it can print the new
> defined hot key without any changed needed.
>
> The output is the below on pressing an undefined hot key:
>
> SysRq : <6>this hot key isn't defined.
          ^^^

This is misplaced.

> @@ -410,7 +420,7 @@ void __handle_sysrq(int key, struct tty_
>  	spin_lock_irqsave(&sysrq_key_table_lock, flags);
>  	orig_log_level = console_loglevel;
>  	console_loglevel = 7;
> -	printk(KERN_INFO "SysRq : ");
> +	printk(KERN_INFO "\nSysRq : ");

It does not make any sense to put the printk level just before the
newline, since the newline resets it to the default level.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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