linux-kernel - Re: [PATCH v2 RFC/RFT] dma-contiguous: Get normal pages for single-page allocations

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Date:   Mon, 25 Mar 2019 11:50:23 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     hch@....de, robin.murphy@....com, vdumpa@...dia.com,
        will.deacon@....com, chris@...kel.net, jcmvbkbc@...il.com,
        joro@...tes.org, dwmw2@...radead.org, m.szyprowski@...sung.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, iommu@...ts.linux-foundation.org,
        jonathanh@...dia.com
Subject: Re: [PATCH v2 RFC/RFT] dma-contiguous: Get normal pages for
 single-page allocations

On Mon, Mar 25, 2019 at 12:14:37PM +0000, Catalin Marinas wrote:

> diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
> index fcdb23e8d2fc..8955ba6f52fc 100644
> --- a/kernel/dma/direct.c
> +++ b/kernel/dma/direct.c
> @@ -111,8 +111,7 @@ struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
>  again:
>  	/* CMA can be used only in the context which permits sleeping */
>  	if (gfpflags_allow_blocking(gfp)) {
> -		page = dma_alloc_from_contiguous(dev, count, page_order,
> -						 gfp & __GFP_NOWARN);
> +		page = dma_alloc_from_contiguous(dev, count, page_order, gfp);

Oh...yea...It should have this part. I messed up with some
thing else so couldn't get it. Thanks for the reply.

I will go for the previous change by returning NULL in the
dma_alloc_from_contiguous() so the no_warm parameter would
not be touched.