linux-kernel - Re: [PATCH 1/4] x86: clean up asm-x86/page*.h

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Date:	Fri, 14 Dec 2007 08:53:51 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Glauber de Oliveira Costa" <glommer@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] x86: clean up asm-x86/page*.h

>>> Jeremy Fitzhardinge <jeremy@...p.org> 14.12.07 09:44 >>>
>Jan Beulich wrote:
>>> --- a/arch/x86/mm/fault_64.c
>>> +++ b/arch/x86/mm/fault_64.c
>>> @@ -158,22 +158,22 @@ void dump_pagetable(unsigned long addres
>>> 	pgd = __va((unsigned long)pgd & PHYSICAL_PAGE_MASK); 
>>> 	pgd += pgd_index(address);
>>> 	if (bad_address(pgd)) goto bad;
>>> -	printk("PGD %lx ", pgd_val(*pgd));
>>> +	printk("PGD %lx ", (unsigned long)pgd_val(*pgd));
>>>     
>>
>> Casts like this here and elsewhere look rather odd (in fact I think using
>> casts should really be limited to places where you either can't do it
>> differently or the code would become badly readable or much uglier
>> without them). I would therefore favor simply using the right formatting
>> specifier here.
>
>I would agree, but pgd_val() is defined as returning a pgdval_t, which
>is typedefed to be unsigned long.  I'll have another look, but I don't
>think there's an appropriate format for this.

Typedef-s can be printed with the same format specifier as the underlying
type. But u64 is (at least in plain -rc5) a typedef of 'unsigned long long', so
the compiler validly warns about the use of 'l' there, and I would assume it's
those compiler warnings that you want to get rid of...

Jan

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