linux-kernel - Re: [RFC][PATCH 1/2] mm: cma: Export cma symbols for cma heap as a module

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Date:   Mon, 28 Oct 2019 00:46:42 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Sandeep Patil <sspatil@...gle.com>,
        Laura Abbott <labbott@...hat.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Pratik Patel <pratikp@...eaurora.org>,
        Brian Starkey <Brian.Starkey@....com>,
        "Andrew F . Davis" <afd@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yue Hu <huyue2@...ong.com>, Mike Rapoport <rppt@...ux.ibm.com>,
        Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Hridya Valsaraju <hridya@...gle.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [RFC][PATCH 1/2] mm: cma: Export cma symbols for cma heap as a
 module

On Fri, Oct 25, 2019 at 11:48:33PM +0000, John Stultz wrote:
>  struct cma *dma_contiguous_default_area;
> +EXPORT_SYMBOL(dma_contiguous_default_area);

Please CC the dma maintainer.  And no, you have no business using this.

Even if you did, internals like this should always be EXPORT_SYMBOL_GPL.