linux-kernel - Re: [PATCH 1/4] dynamic_debug: consolidate repetitive struct

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Date:	Fri, 09 Sep 2011 15:32:05 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jim Cromie <jim.cromie@...il.com>
Cc:	Jason Baron <jbaron@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, gregkh@...e.de,
	Bart Van Assche <bvanassche@....org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dynamic_debug: consolidate repetitive struct
 _ddebug descriptor definitions

On Fri, 2011-09-09 at 16:06 -0600, Jim Cromie wrote:
> The trick is then to allow those users to define flag-chars that they like
> (mnemonic value), and that work with the dynamic-debug mini-language
> implemented in $CONTROL reader.

I don't think that's a problem really.

I think a simple control/test variable as either value
or mask would work fine.

Take a single bit control to either test as mask
or test as level.  No mnemonic letters needed.

pr_debug_mask(mask, fmt, ...)
pr_debug_level(level, fmt, ...)

could set the appropriate type bit in the struct
so the test works as appropriate.

echo 'value <foo>' > <debugfs>/dynamic_debug/control

> But that begs the question - is there a reason why __aligned(4)
> wouldnt work for 32 bit machines ?   It would reduce the footprint
> for small machines.

No real idea why it's aligned(8).  Jason?

> Also, what is your notion of level ?

Driver specific value.
Look at the _dbg uses in drivers/net/wireless/ath for example.
I believe there are only two types of uses in the kernel:
module debug level and module debug mask output controls.

> it is independent of the error,warning,info,debug levels correct ?

Yes.  Attached to debug output only.

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