Re: [PATCH] dma-buf: move dma-buf symbols into the DMA_BUF module namespace

[Greg Kroah-Hartman]

On Tue, Sep 28, 2021 at 09:31:45AM +0200, Daniel Vetter wrote:
> On Sat, Sep 25, 2021 at 03:47:00PM +0200, Greg Kroah-Hartman wrote:
> > In order to better track where in the kernel the dma-buf code is used,
> > put the symbols in the namespace DMA_BUF and modify all users of the
> > symbols to properly import the namespace to not break the build at the
> > same time.
> > 
> > Now the output of modinfo shows the use of these symbols, making it
> > easier to watch for users over time:
> > 
> > $ modinfo drivers/misc/fastrpc.ko | grep import
> > import_ns:      DMA_BUF
> > 
> > Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
> > Cc: "Christian König" <christian.koenig@xxxxxxx>
> > Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> > Cc: "Pan, Xinhui" <Xinhui.Pan@xxxxxxx>
> > Cc: David Airlie <airlied@xxxxxxxx>
> > Cc: Daniel Vetter <daniel@xxxxxxxx>
> > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> > Cc: Maxime Ripard <mripard@xxxxxxxxxx>
> > Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> > Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> > Cc: Arnd Bergmann <arnd@xxxxxxxx>
> > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> > ---
> > 
> > The topic of dma-buf came up in the Maintainer's summit yesterday, and
> > one comment was to put the symbols in their own module namespace, to
> > make it easier to notice and track who was using them.  This patch does
> > so, and finds some "interesting" users of the api already in the tree.
> 
> Yeah, the interesting ones is why I added the dma-buf wildcard match a
> while ago.  Since that landed I don't think anything escaped. Should we
> perhaps also add
> 
> K: MODULE_IMPORT_NS(DMA_BUF);
> 
> to the dma-buf MAINATINERS entry? Entirely untested, also no idea whether
> there's not a better way to match for module namespaces. Either way:

I don't know if that would really work, if anything, just make the
MAINTAINERS file harder to maintain :)

> Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

Thanks for the review, I'll send out a v2 later today...

greg k-h