netdev - Re: [PATCH 2/7] RDMA/hfi1: don't pass bogus GFP_ flags to dma_alloc

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Message-ID: <Y3P5G4IczsFR5Lky@ziepe.ca>
Date:   Tue, 15 Nov 2022 16:39:55 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Christoph Hellwig <hch@....de>
Cc:     Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alexandra Winter <wintera@...ux.ibm.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Russell King <linux@...linux.org.uk>,
        Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-rdma@...r.kernel.org,
        iommu@...ts.linux.dev, linux-media@...r.kernel.org,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 2/7] RDMA/hfi1: don't pass bogus GFP_ flags to
 dma_alloc_coherent

On Sun, Nov 13, 2022 at 05:35:30PM +0100, Christoph Hellwig wrote:
> dma_alloc_coherent is an opaque allocator that only uses the GFP_ flags
> for allocation context control.  Don't pass GFP_USER which doesn't make
> sense for a kernel DMA allocation or __GFP_COMP which makes no sense
> for an allocation that can't in any way be converted to a page pointer.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  drivers/infiniband/hw/hfi1/init.c | 21 +++------------------
>  1 file changed, 3 insertions(+), 18 deletions(-)

I have no idea what qib was trying to do here, but I'm fine if you
take this through another tree

Acked-by: Jason Gunthorpe <jgg@...dia.com>

Jason