linux-kernel - Re: [PATCH 1/2] cma: use macro PFN_DOWN when converting size to pages

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Date:	Mon, 5 Aug 2013 17:05:34 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] cma: use macro PFN_DOWN when converting size to pages

On 2013/8/5 16:54, Greg Kroah-Hartman wrote:

> On Mon, Aug 05, 2013 at 04:31:00PM +0800, Xishi Qiu wrote:
>> Use "PFN_DOWN(r->size)" instead of "r->size >> PAGE_SHIFT".
>>
>> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
>> ---
>>  drivers/base/dma-contiguous.c |    5 ++---
>>  1 files changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
>> index 0ca5442..1bcfaed 100644
>> --- a/drivers/base/dma-contiguous.c
>> +++ b/drivers/base/dma-contiguous.c
>> @@ -201,13 +201,12 @@ static int __init cma_init_reserved_areas(void)
>>  {
>>  	struct cma_reserved *r = cma_reserved;
>>  	unsigned i = cma_reserved_count;
>> +	struct cma *cma;
> 
> Why change this?
> 
>>  
>>  	pr_debug("%s()\n", __func__);
>>  
>>  	for (; i; --i, ++r) {
>> -		struct cma *cma;
>> -		cma = cma_create_area(PFN_DOWN(r->start),
>> -				      r->size >> PAGE_SHIFT);
>> +		cma = cma_create_area(PFN_DOWN(r->start), PFN_DOWN(r->size));
> 
> That's reasonable to clean up, but nothing major.  Care to resend this
> without the cma change?
> 

Thank you and I will resend it soon.

Thanks,
Xishi Qiu

> thanks,
> 
> greg k-h
> 


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