linux-kernel - Re: [PATCH] lib: Replace calls to __get_free_pages() with __get_dma

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Date:	Tue, 5 Jun 2007 17:06:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lib:  Replace calls to __get_free_pages() with
 __get_dma_pages().

On Tue, 5 Jun 2007 16:58:57 -0400 (EDT)
"Robert P. J. Day" <rpjday@...dspring.com> wrote:

> Replace a couple calls to __get_free_pages() with the corresponding
> calls to __get_dma_pages().
> 
> Signed-off-by: Robert P. J. Day <rpjday@...dspring.com>
> 
> ---
> 
>   that's the lot of them.
> 
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index 10c13ad..8fc38dc 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -201,8 +201,7 @@ swiotlb_late_init_with_default_size(size_t default_size)
>  	bytes = io_tlb_nslabs << IO_TLB_SHIFT;
> 
>  	while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
> -		io_tlb_start = (char *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
> -		                                        order);
> +		io_tlb_start = (char *)__get_dma_pages(__GFP_NOWARN, order);

__get_dma_pages() is just pointless obfuscation.  I think it'd be better to
go the other way: open-code the GFP_DMA at all callsites then send
__get_dma_pages() bitbucketwards.

-
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