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Subject: Re: How do I printk <type> correctly?
From: Artem Bityutskiy <dedekind@infradead.org>
Reply-To: dedekind@infradead.org
To: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>, lkml <linux-kernel@vger.kernel.org>,
       ericvh@gmail.com, mfasheh@suse.com
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	 <20081028161136.c652b9fd.randy.dunlap@oracle.com>
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Date: Wed, 29 Oct 2008 10:00:04 +0200
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On Tue, 2008-10-28 at 16:11 -0700, Randy Dunlap wrote:
> On Thu, 23 Oct 2008 15:41:33 +0400 Alexey Dobriyan wrote:
> 
> > If variable is of Type	use	printk format specifier.
> > ---------------------------------------------------------
> > 		int			%d or %x
> > 		unsigned int		%u or %x
> > 		long			%ld ot %lx
> > 		unsigned long		%lu or %lx
> > 		long long		%lld or %llx
> > 		unsigned long long	%llu or %llx
> > 		size_t			%zu or %zx
> > 		ssize_t			%zd or %zx
> > 
> > Raw pointer value SHOULD be printed with %p.
> > 
> > u64 SHOULD be printed with %llu/%llx, (unsigned long long):
> > 
> > 	printk("%llu", (unsigned long long)u64_var);
> > 
> > s64 SHOULD be printed with %lld/%llx, (long long):
> > 
> > 	printk("%lld", (long long)s64_var);
> > 
> > If type is dependent on config option (sector_t), use format specifier
> > of biggest type and explicitly cast to it.
> > 
> > Reminder: sizeof() result is of type size_t.

Do we have this somewhere in Documentation? Would be nice to have it.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)