netdev - RE: [PATCH 5/6] ath6kl: convert ath6kl_dbg() and ath6kl_dbg

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Date:	Thu, 5 Jan 2012 10:41:28 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Joe Perches" <joe@...ches.com>,
	"Kalle Valo" <kvalo@....qualcomm.com>
Cc:	<linville@...driver.com>, <sfr@...b.auug.org.au>,
	<netdev@...r.kernel.org>, <linux-wireless@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-next@...r.kernel.org>,
	<ath6kl-devel@...lcomm.com>, <davem@...emloft.net>
Subject: RE: [PATCH 5/6] ath6kl: convert ath6kl_dbg() and ath6kl_dbg_dump() into functions

 
> > +	va_start(args, fmt);
> > +	ath6kl_printk(KERN_DEBUG, fmt, &args);
> 
> Passing a va_list as an argument?
> I believe this doesn't work.
> I think you'll need to add and use:

Passing a va_list certainly does work - vprintf() etc.
What is problematical is taking the address of a va_list.

The likely problem is a 'levels of indirection' one
because, when va_list needs to be a struct (very
likely when arguments are passed in registers),
it is often declared as as array type.

	David


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