linux-kernel - Re: [PATCH wireless-next 2/3] ath5k: Introduce _ath5k

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Message-ID: <CAJ-Vmo=ceSV38vQGfs8cKJScWjYF4kbQdK3+JJvQLCmnURaEwA@mail.gmail.com>
Date:	Sun, 18 Mar 2012 21:36:49 -0700
From:	Adrian Chadd <adrian@...ebsd.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Nick Kossifidis <mickflemm@...il.com>,
	"Luis R. Rodriguez" <mcgrof@....qualcomm.com>,
	Bob Copeland <me@...copeland.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, ath5k-devel@...ts.ath5k.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH wireless-next 2/3] ath5k: Introduce _ath5k_printk to
 reduce code/text

Hi,

So the reason this is a macro in the FreeBSD HAL is so that the args
aren't evaluated unless the level (or debug bitmap in my case) fires
off.

Otherwise compiling in debugging will cause a _lot_ of spurious
register reads to occur that are then tossed. This was one of the big
reasons for instability and slow performance when AH_DEBUG was
enabled.



Adrian
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