linux-kernel - Re: [RFC PATCH v2 1/3] USB: use genalloc for USB HCs with local memory

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Message-ID: <20190515124250.GA13754@lst.de>
Date:   Wed, 15 May 2019 14:42:50 +0200
From:   Christoph Hellwig <hch@....de>
To:     Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     Christoph Hellwig <hch@....de>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "marex@...x.de" <marex@...x.de>, Leo Li <leoyang.li@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robin.murphy@....com" <robin.murphy@....com>
Subject: Re: [RFC PATCH v2 1/3] USB: use genalloc for USB HCs with local
 memory

On Wed, May 15, 2019 at 09:57:12AM +0000, Laurentiu Tudor wrote:
> Glad I could help. On the remoteproc_virtio.c case, I had a cursory look 
> and found out that the dma_declare_coherent_memory() usage was 
> introduced quite recently, by this patch:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086d08725d34c6b3333db710344ae9c4fdafb2d5

Yes.  I took a look at it to, and while it isn't exactly a clean
usage of the API it at least declares system memory and not a resource.
So it doesn't really affect our plan.