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

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Message-ID: <20130805085404.GA22170@kroah.com>
Date:	Mon, 5 Aug 2013 16:54:04 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Xishi Qiu <qiuxishi@...wei.com>
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 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?

thanks,

greg k-h
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