linux-kernel - Re: How to printk unsigned long long variable?

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Message-ID: <adaabv1i49q.fsf@cisco.com>
Date:	Fri, 15 Jun 2007 09:14:25 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	"jidong xiao" <jidong.xiao@...il.com>
Cc:	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"Vegard Nossum" <vegard.nossum@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: How to printk unsigned long long variable?

 > Is this right?

 >        dev->dev.dma_mask = bus->controller->dma_mask;
 >        printk(KERN_ERR "hey,jason,see,dma_mask is
 > %llu\n",*(dev->dev.dma_mask));

No, why do you have the '*' -- dma_mask isn't a pointer, is it?

You probably want:

	printk(KERN_ERR "hey,jason,see,dma_mask is %llx\n",
	       (unsigned long long) dev->dev.dma_mask);

(I would use a "%llx" format because masks are much clearer in hex).
The cast to unsigned long long is there because u64 is just unsigned
long on some 64-bit platforms, so you get a warning about the format
not matching on some architectures without the cast.

 - R.
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