linux-kernel - Re: [PATCH -v2 2/2] printk: Add kernel parameter to control writes to /dev/kmsg

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Date:	Fri, 1 Jul 2016 11:17:11 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Franck Bui <fbui@...e.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v2 2/2] printk: Add kernel parameter to control writes
 to /dev/kmsg

On Fri, Jul 01, 2016 at 11:04:13AM +0200, Ingo Molnar wrote:

...

> So the most robust way to define such bitfields is via a pattern like this:
> 
> enum devkmsg_log_bits {
> 	__DEVKMSG_LOG_BIT_ON,
> 	__DEVKMSG_LOG_BIT_OFF,
> 	__DEVKMSG_LOG_BIT_LOCK,
> };
> 
> enum devkmsg_log_masks {
> 	DEVKMSG_LOG_MASK_ON		= BIT(__DEVKMSG_LOG_BIT_ON),
> 	DEVKMSG_LOG_MASK_OFF		= BIT(__DEVKMSG_LOG_BIT_OFF),
> 	DEVKMSG_LOG_MASK_LOCK		= BIT(__DEVKMSG_LOG_BIT_LOCK),

Agreed with so far, I'd only drop the "_MASK" thing and make it even
easier on the eyes:

enum devkmsg_log_state {
	DEVKMSG_LOG_ON		= BIT(__DEVKMSG_LOG_BIT_ON),
	DEVKMSG_LOG_OFF		= BIT(__DEVKMSG_LOG_BIT_OFF),
	DEVKMSG_LOCK		= BIT(__DEVKMSG_LOG_BIT_LOCK),
};

Now this makes the checking code even more readable!

	if (devkmsg_log & DEVKMSG_LOCK) {

and

	if (devkmsg_log & DEVKMSG_LOG_OFF)

and

	if ((system_state != SYSTEM_BOOTING) && (!(devkmsg_log & DEVKMSG_LOG_ON)) {


And this way you can read it straight-away as english text.

:-)))

Thanks.

-- 
Regards/Gruss,
    Boris.

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