linux-kernel - Re: [PATCH 2/2] swiotlb-xen: override common mmap and get

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Message-ID: <20210616142148.GA764@lst.de>
Date:   Wed, 16 Jun 2021 16:21:48 +0200
From:   Christoph Hellwig <hch@....de>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Roman Skakun <rm.skakun@...il.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>,
        Volodymyr Babchuk <volodymyr_babchuk@...m.com>,
        Roman Skakun <roman_skakun@...m.com>,
        Andrii Anisov <andrii_anisov@...m.com>
Subject: Re: [PATCH 2/2] swiotlb-xen: override common mmap and get_sgtable
 dma ops

On Wed, Jun 16, 2021 at 10:12:55AM -0400, Boris Ostrovsky wrote:
> I wonder now whether we could avoid code duplication between here and dma_common_mmap()/dma_common_get_sgtable() and use your helper there.
> 
> 
> Christoph, would that work?  I.e. something like

You should not duplicate the code at all, and just make the common
helpers work with vmalloc addresses.