Re: [RFC PATCH 1/5] base: dma-mapping: Export commonly used symbols

From: Tomasz Figa
Date: Wed Jul 05 2017 - 11:23:09 EST

Hi Christoph,

Thanks for comments!

On Thu, Jul 6, 2017 at 12:17 AM, Christoph Hellwig <hch@xxxxxx> wrote:
> Please use EXPORT_SYMBOL_GPL for any of these exports, as they are
> internal linux implementration details by any definition of it.

Right. I typically lean towards EXPORT_SYMBOL_GPL(), but was misled by
existing EXPORT_SYMBOL()s in the file. Will fix.

> On Wed, Jul 05, 2017 at 04:12:11PM +0900, Tomasz Figa wrote:
>> There is nothing wrong in having a loadable module implementing DMA API,
>> for example to be used for sub-devices registered by the module.
>> However, most of the functions from dma-mapping do not have their
>> symbols exported, making it impossible to use them from loadable modules.
> I'd like to see the patches for this use case as well. We don't
> generally export symbols without seeing the users.

Generally the user is a work in progress that should be posted in a
very near future. You can find a reference to our downstream tree at in the cover letter. Obviously I don't mind including
patches from this series in the driver series later and that's one of
the reasons for this series being RFC.

Best regards,