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From:   Claire Chang <tientzu@chromium.org>
Date:   Fri, 26 Feb 2021 12:17:50 +0800
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Subject: Re: [PATCH v4 12/14] swiotlb: Add restricted DMA alloc/free support.
To:     Rob Herring <robh+dt@kernel.org>, mpe@ellerman.id.au,
        Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
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        "list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
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> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index fd9c1bd183ac..8b77fd64199e 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -836,6 +836,40 @@ late_initcall(swiotlb_create_default_debugfs);
>  #endif
>
>  #ifdef CONFIG_DMA_RESTRICTED_POOL
> +struct page *dev_swiotlb_alloc(struct device *dev, size_t size, gfp_t gfp)
> +{
> +       struct swiotlb *swiotlb;
> +       phys_addr_t tlb_addr;
> +       unsigned int index;
> +
> +       /* dev_swiotlb_alloc can be used only in the context which permits sleeping. */
> +       if (!dev->dev_swiotlb || !gfpflags_allow_blocking(gfp))

Just noticed that !gfpflags_allow_blocking(gfp) shouldn't be here.

Hi Christoph,

Do you think I should fix this and rebase on the latest linux-next
now? I wonder if there are more factor and clean up coming and I
should wait after that.

Thanks,
Claire