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

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Date:	Fri, 09 Sep 2011 14:04:11 -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 13:23 -0600, Jim Cromie wrote:
> It also allows for "lite" usage of dynamic-debug,
> including 1..few descriptor per file or module to control all debug printing.
> As outlined, this "lite" usage is determined by the coder,
> it would be cool if it were more configurable than that,
> but I dont see how that would work atm.

General problem is that there are subsystems that use
bitmasks with more than a just a few bits defined.

> Now that the worms have escaped the can, one other thought:
> 	unsigned int lineno:24;
> allows for insanely large files.  The largest in the tree is 29k,
> 16 bits would cover all files likely to be accepted in the future.

I hope ever.

> Since since it works with module/file/function filtering, 3-4 user
> flags should be plenty.

I rather doubt it as there are both level and mask uses.

There is no real issue with adding another flag value
to the struct anyway.  It's declared __aligned(8) and
it ends in an unaligned single char so there's space
for another u32 without extending the structure size.



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