linux-kernel - Re: [PATCH] drm: msm: fix building without CONFIG_COMMON

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Message-ID: <CAMuHMdVW3eBAozRLcWXfeh20ycC4sjfrjPv+yrf89xLSM0VMpQ@mail.gmail.com>
Date:   Mon, 18 Oct 2021 13:49:50 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christian König <christian.koenig@....com>
Cc:     Arnd Bergmann <arnd@...nel.org>, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Arnd Bergmann <arnd@...db.de>,
        Randy Dunlap <rdunlap@...radead.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Alex Elder <elder@...aro.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        Rajeev Nandan <rajeevny@...eaurora.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        freedreno@...ts.freedesktop.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm: msm: fix building without CONFIG_COMMON_CLK

Hi Christian,

On Mon, Oct 18, 2021 at 1:41 PM Christian König
<christian.koenig@....com> wrote:
> Am 18.10.21 um 13:38 schrieb Geert Uytterhoeven:
> > On Mon, Oct 18, 2021 at 1:37 PM Christian König
> > <christian.koenig@....com> wrote:
> >> Am 13.10.21 um 16:42 schrieb Arnd Bergmann:
> >>> From: Arnd Bergmann <arnd@...db.de>
> >>>
> >>> When CONFIG_COMMON_CLOCK is disabled, the 8996 specific
> >>> phy code is left out, which results in a link failure:
> >>>
> >>> ld: drivers/gpu/drm/msm/hdmi/hdmi_phy.o:(.rodata+0x3f0): undefined reference to `msm_hdmi_phy_8996_cfg'
> >>>
> >>> This was only exposed after it became possible to build
> >>> test the driver without the clock interfaces.
> >>>
> >>> Make COMMON_CLK a hard dependency for compile testing,
> >>> and simplify it a little based on that.
> >>>
> >>> Fixes: b3ed524f84f5 ("drm/msm: allow compile_test on !ARM")
> >>> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> >>> Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> >>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> >>> ---
> >>>    drivers/gpu/drm/msm/Kconfig  | 2 +-
> >>>    drivers/gpu/drm/msm/Makefile | 6 +++---
> >>>    2 files changed, 4 insertions(+), 4 deletions(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
> >>> index f5107b6ded7b..cb204912e0f4 100644
> >>> --- a/drivers/gpu/drm/msm/Kconfig
> >>> +++ b/drivers/gpu/drm/msm/Kconfig
> >>> @@ -4,8 +4,8 @@ config DRM_MSM
> >>>        tristate "MSM DRM"
> >>>        depends on DRM
> >>>        depends on ARCH_QCOM || SOC_IMX5 || COMPILE_TEST
> >>> +     depends on COMMON_CLK
> >>>        depends on IOMMU_SUPPORT
> >> We also need a "depends on MMU" here because some automated test is now
> >> trying to compile the driver on parisc as well.
> >>
> >> I have absolutely no idea how a platform can have IOMMU but no MMU
> >> support but it indeed seems to be the case here.
> > Huh?
> >
> > Parisc has config MMU def_bool y?
>
> Then why vmap isn't available?
>
> See the mail thread: [linux-next:master 3576/7806]
> drivers/gpu/drm/msm/msm_gem.c:624:20: error: implicit declaration of
> function 'vmap'

You mean https://lore.kernel.org/all/202110141259.i36iJnsA-lkp@intel.com/?

Hexagon != parisc.
.
And Hexagon also has config MMU def_bool y

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds