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

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Message-ID: <CAK8P3a3pdVhjv4J4HSB1cvHU7U_P7TV7HCOYmrK==V_MAnT2BQ@mail.gmail.com>
Date:   Sat, 25 Sep 2021 19:41:03 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     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>,
        Daniel Vetter <daniel@...ll.ch>,
        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 <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma-buf: move dma-buf symbols into the DMA_BUF module namespace

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

Acked-by: Arnd Bergmann <arnd@...db.de>

> 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.

      Arnd