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

From: Arnd Bergmann
Date: Sat Sep 25 2021 - 13:41:38 EST

On Sat, Sep 25, 2021 at 3:47 PM Greg Kroah-Hartman
<gregkh@xxxxxxxxxxxxxxxxxxx> 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>

Acked-by: Arnd Bergmann <arnd@xxxxxxxx>

> 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.
> Only test-built on x86 allmodconfig, don't know what other arches will
> pick up, will let 0-day run on it for a bit...

I've added it to my build box doing arm32/arm64/x86 randconfig tests,
if it doesn't report anything by Monday, it's probably good in that regard.