linux-kernel - Re: [PATCH 27/33] dma-direct: use node local allocations for coherent memory

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Message-ID: <3672aa56-b85c-5d2c-0c0e-709031b0c0a0@arm.com>
Date:   Wed, 10 Jan 2018 12:06:22 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org
Cc:     linux-mips@...ux-mips.org, linux-ia64@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        Guan Xuetao <gxt@...c.pku.edu.cn>, linux-arch@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-c6x-dev@...ux-c6x.org,
        linux-hexagon@...r.kernel.org, x86@...nel.org,
        Konrad Rzeszutek Wilk <konrad@...nok.org>,
        linux-snps-arc@...ts.infradead.org,
        linux-m68k@...ts.linux-m68k.org, patches@...ups.riscv.org,
        linux-metag@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Michal Simek <monstr@...str.eu>, linux-parisc@...r.kernel.org,
        linux-cris-kernel@...s.com, linux-kernel@...r.kernel.org,
        linux-alpha@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 27/33] dma-direct: use node local allocations for coherent
 memory

On 10/01/18 08:00, Christoph Hellwig wrote:
> To preserve the x86 behavior.

And combined with patch 10/22 of the SWIOTLB refactoring, this means 
SWIOTLB allocations will also end up NUMA-aware, right? Great, that's 
what we want on arm64 too :)

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   lib/dma-direct.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/dma-direct.c b/lib/dma-direct.c
> index a9ae98be7af3..f04a424f91fa 100644
> --- a/lib/dma-direct.c
> +++ b/lib/dma-direct.c
> @@ -38,7 +38,7 @@ static void *dma_direct_alloc(struct device *dev, size_t size,
>   	if (gfpflags_allow_blocking(gfp))
>   		page = dma_alloc_from_contiguous(dev, count, page_order, gfp);
>   	if (!page)
> -		page = alloc_pages(gfp, page_order);
> +		page = alloc_pages_node(dev_to_node(dev), gfp, page_order);
>   	if (!page)
>   		return NULL;
>   
>