linux-kernel - Re: [PATCH] drm/imx/dcss: fix compilation issue on 32bit

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Message-ID: <20200910102128.5agk4vxf2jeonw3q@fsr-ub1864-141>
Date:   Thu, 10 Sep 2020 13:21:28 +0300
From:   Laurentiu Palcu <laurentiu.palcu@....nxp.com>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/imx/dcss: fix compilation issue on 32bit

On Thu, Sep 10, 2020 at 11:57:10AM +0200, Daniel Vetter wrote:
> On Thu, Sep 10, 2020 at 11:53 AM Laurentiu Palcu
> <laurentiu.palcu@....nxp.com> wrote:
> >
> > When compiling for 32bit platforms, the compilation fails with:
> >
> > ERROR: modpost: "__aeabi_ldivmod"
> > [drivers/gpu/drm/imx/dcss/imx-dcss.ko] undefined!
> > ERROR: modpost: "__aeabi_uldivmod"
> > [drivers/gpu/drm/imx/dcss/imx-dcss.ko] undefined!
> >
> > This patch adds a dependency on ARM64 since no 32bit SoCs have DCSS, so far.
> 
> Usual way to fix this correctly is using the right division macros,
> not limiting the driver to 64bit. But this works for now, would be
> good to fix this properly for compile-testing and all that.

I didn't see the point in using the macros since this is running only on
64bit. Though I will probably revisit it and fix it properly in a
subsequent patch.

> 
> > Signed-off-by: Laurentiu Palcu <laurentiu.palcu@....nxp.com>
> > Reported-by: Daniel Vetter <daniel@...ll.ch>
> 
> Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
> 
> Please push to drm-misc-next.

About that, I may need some help pushing it. Apparently, my request for
a legacy SSH account for contributing to drm-misc got stalled:

https://gitlab.freedesktop.org/freedesktop/freedesktop/-/issues/289

Thanks,
laurentiu

> -Daniel
> 
> 
> 
> ---
> >  drivers/gpu/drm/imx/dcss/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/imx/dcss/Kconfig b/drivers/gpu/drm/imx/dcss/Kconfig
> > index 69860de8861f..2b17a964ff05 100644
> > --- a/drivers/gpu/drm/imx/dcss/Kconfig
> > +++ b/drivers/gpu/drm/imx/dcss/Kconfig
> > @@ -3,7 +3,7 @@ config DRM_IMX_DCSS
> >         select IMX_IRQSTEER
> >         select DRM_KMS_CMA_HELPER
> >         select VIDEOMODE_HELPERS
> > -       depends on DRM && ARCH_MXC
> > +       depends on DRM && ARCH_MXC && ARM64
> >         help
> >           Choose this if you have a NXP i.MX8MQ based system and want to use the
> >           Display Controller Subsystem. This option enables DCSS support.
> > --
> > 2.17.1
> >
> 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch