linux-kernel - Re: [PATCH V2] x86/mm: Fix zone ranges boot printout

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Date:	Wed, 10 Dec 2014 09:40:01 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...nel.org>, <dave@...1.net>,
	Rik van Riel <riel@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	<linux-tip-commits@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH V2] x86/mm: Fix zone ranges boot printout

On 2014/12/10 6:50, Andrew Morton wrote:

> On Tue, 9 Dec 2014 11:27:20 +0800 Xishi Qiu <qiuxishi@...wei.com> wrote:
> 
>> Changelog:
>> V2:
>> 	-fix building warnings of min(...).
>>
>> ...
>>
>> --- a/arch/x86/mm/init.c
>> +++ b/arch/x86/mm/init.c
>> @@ -674,10 +674,12 @@ void __init zone_sizes_init(void)
>>  	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
>>  
>>  #ifdef CONFIG_ZONE_DMA
>> -	max_zone_pfns[ZONE_DMA]		= MAX_DMA_PFN;
>> +	max_zone_pfns[ZONE_DMA]		= min_t(unsigned long,
>> +						max_low_pfn, MAX_DMA_PFN);
> 
> MAX_DMA_PFN has type int.
> 
>>  #endif
>>  #ifdef CONFIG_ZONE_DMA32
>> -	max_zone_pfns[ZONE_DMA32]	= MAX_DMA32_PFN;
>> +	max_zone_pfns[ZONE_DMA32]	= min_t(unsigned long,
>> +						max_low_pfn, MAX_DMA32_PFN);
> 
> MAX_DMA32_PFN has type UL (I think?) so there's no need for min_t here.
> 
>>  #endif
>>  	max_zone_pfns[ZONE_NORMAL]	= max_low_pfn;
>>  #ifdef CONFIG_HIGHMEM
> 
> 
> Let's try to get the types correct, rather than hacking around fixing
> up fallout from earlier incorrect type choices?
> 
> What is the type of a pfn?  Unsigned long, generally, when we bother
> thinking about it.
> 
> So how about we make MAX_DMA_PFN have type UL?  I assume that fixes the
> warning?
> 
> If we do this, we should also be able to undo the min_t hackery in
> arch/x86/kernel/e820.c:memblock_find_dma_reserve().
> 

Hi Andrew,

Thanks for your suggestion, I'll resend V3.

Thanks,
Xishi Qiu

> 
> .
> 



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