linux-kernel - Re: [PATCH 61/7] x86/pci: add cap

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Date:	Fri, 11 Dec 2009 18:20:31 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Gertjan van Wingerde <gwingerde@...il.com>
Subject: Re: [PATCH 61/7] x86/pci: add cap_4g

H. Peter Anvin wrote:
> On 12/11/2009 06:11 PM, Yinghai Lu wrote:
>>  
>> +static inline u64 cap_4g(u64 val)
>> +{
>> +	if (sizeof(resource_size_t) >= sizeof(u64))
>> +		return val;
>> +
>> +	if (val < 1ULL)
>> +		return val;
>> +
>> +	return 0xffffffff;
>> +}
>>  #endif
> 
> How about:
> 
> static inline resource_size_t cap_resource(u64 val)
> {
> 	if (val > ~(resource_size_t)0)
> 		return ~(resource_size_t)0;
> 	else
> 		return val;
> }

ok
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