linux-kernel - Re: [PATCH] drm/rockchip: avoid 64-bit division

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Message-ID: <ff5eq2x5vhv3jxv6fjjd3bdohndyhurxqa3o4a5jbnis3543wb@jyfd3iikkzc2>
Date: Fri, 18 Oct 2024 18:54:03 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Sandy Huang <hjc@...k-chips.com>, 
	Heiko Stübner <heiko@...ech.de>, Andy Yan <andy.yan@...k-chips.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Algea Cao <algea.cao@...k-chips.com>, 
	Cristian Ciocaltea <cristian.ciocaltea@...labora.com>, Arnd Bergmann <arnd@...db.de>, dri-devel@...ts.freedesktop.org, 
	linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/rockchip: avoid 64-bit division

On Fri, Oct 18, 2024 at 03:10:10PM +0000, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Dividing a 64-bit integer prevents building this for 32-bit targets:
> 
> ERROR: modpost: "__aeabi_uldivmod" [drivers/gpu/drm/rockchip/rockchipdrm.ko] undefined!
> 
> As this function is not performance criticial, just Use the div_u64() helper.
> 
> Fixes: 128a9bf8ace2 ("drm/rockchip: Add basic RK3588 HDMI output support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry