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Date: Tue, 29 Jan 2013 02:54:28 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] fix 32-bit compile warning from printk()
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On Mon, 28 Jan 2013 11:19:39 -0800 Dave Hansen <dave@linux.vnet.ibm.com> wrote:

> My patch "Fix kvm's use of __pa() on percpu areas" introduced a
> compile warning:
> 
> arch/x86/kernel/kvm.c: In function 'kvm_register_steal_time':
> arch/x86/kernel/kvm.c:302:3: warning: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'phys_addr_t' [-Wformat]
> 
> According to: Documentation/printk-formats.txt
> 
> 	If <type> is dependent on a config option for its size
> 	(e.g., phys_addr_t) ... use a format specifier of its
> 	largest possible type and explicitly cast to it.
> 
> So, we'll do just that.  We will consider it an unsigned long
> long, and cast to it explicitly.

Please note that I have
http://ozlabs.org/~akpm/mmots/broken-out/lib-vsprintf-add-%25pa-format-specifier-for-phys_addr_t-types.patch
queued for 3.8.