linux-kernel - Re: use generic DMA mapping code in powerpc V4

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Date:   Fri, 18 Jan 2019 13:46:46 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-arch@...r.kernel.org,
        Darren Stevens <darren@...vens-zone.net>,
        linux-kernel@...r.kernel.org, Julian Margetson <runaway@...dw.ms>,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Paul Mackerras <paulus@...ba.org>,
        Olof Johansson <olof@...om.net>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: use generic DMA mapping code in powerpc V4

Sorry, it's not possible to patch 
'257002094bc5935dd63207a380d9698ab81f0775' with your patch. I also tried 
it manually but without any success.

-- Christian

On 18 January 2019 at 1:18PM, Christoph Hellwig wrote:
> On Fri, Jan 18, 2019 at 01:07:54PM +0100, Christian Zigotzky wrote:
>> git clone git://git.infradead.org/users/hch/misc.git -b powerpc-dma.6 a
>>
>> git checkout 257002094bc5935dd63207a380d9698ab81f0775
>>
>>
>> I get the following error message with your patch:
> Hmm.  Did I attached the wrong patch?  Here is the one I want and just
> applied to that revision:
>
> diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
> index 355d16acee6d..e46c9b64ec0d 100644
> --- a/kernel/dma/direct.c
> +++ b/kernel/dma/direct.c
> @@ -118,8 +118,11 @@ struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
>   			page = NULL;
>   		}
>   	}
> -	if (!page)
> +	if (!page) {
>   		page = alloc_pages_node(dev_to_node(dev), gfp, page_order);
> +		if (!page)
> +			pr_warn("failed to allocate memory with gfp 0x%x\n", gfp);
> +	}
>   
>   	if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
>   		__free_pages(page, page_order);
> @@ -139,6 +142,10 @@ struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
>   		}
>   	}
>   
> +	if (!page) {
> +		pr_warn("failed to allocate DMA memory!\n");
> +		dump_stack();
> +	}
>   	return page;
>   }
>   
>