linux-kernel - Re: [PATCH] dma-buf: move dma-buf symbols into the DMA

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Date:   Tue, 28 Sep 2021 09:51:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-buf: move dma-buf symbols into the DMA_BUF module
 namespace

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@...aro.org>
> > Cc: "Christian König" <christian.koenig@....com>
> > Cc: Alex Deucher <alexander.deucher@....com>
> > Cc: "Pan, Xinhui" <Xinhui.Pan@....com>
> > Cc: David Airlie <airlied@...ux.ie>
> > Cc: Daniel Vetter <daniel@...ll.ch>
> > Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> > Cc: Maxime Ripard <mripard@...nel.org>
> > Cc: Thomas Zimmermann <tzimmermann@...e.de>
> > Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: dri-devel@...ts.freedesktop.org
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> > 
> > 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@...ll.ch>

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

greg k-h