linux-kernel - Re: [PATCH] drm/bridge: ps8640: Fix size mismatch warning w/ len

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Date: Tue, 19 Dec 2023 07:15:21 -0800
From: Doug Anderson <dianders@...omium.org>
To: dri-devel@...ts.freedesktop.org
Cc: Guenter Roeck <groeck@...omium.org>, Andrzej Hajda <andrzej.hajda@...el.com>, 
	Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Jonas Karlman <jonas@...boo.se>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
	Sam Ravnborg <sam@...nborg.org>, Thomas Zimmermann <tzimmermann@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: ps8640: Fix size mismatch warning w/ len

Hi,

On Mon, Dec 18, 2023 at 9:05 AM Douglas Anderson <dianders@...omium.org> wrote:
>
> After commit 26195af57798 ("drm/bridge: ps8640: Drop the ability of
> ps8640 to fetch the EDID"), I got an error compiling:
>
>   error: comparison of distinct pointer types
>   ('typeof (len) *' (aka 'unsigned int *') and
>    'typeof (msg->size) *' (aka 'unsigned long *'))
>   [-Werror,-Wcompare-distinct-pointer-types]
>
> Fix it by declaring the `len` as size_t.
>
> Fixes: 26195af57798 ("drm/bridge: ps8640: Drop the ability of ps8640 to fetch the EDID")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> Sorry for sending this hot on the heels of the other patch, but for
> some reason that other patch compiled fine for me until I picked it
> back to my downstream tree. I'll see if I can track down why. In any
> case, as soon as I see a Reviewed-by tag I'll land this.
>
>  drivers/gpu/drm/bridge/parade-ps8640.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

I've added a short explanation that the issue only shows up on
backports to kernels that don't have commit d03eba99f5bf ("minmax:
allow min()/max()/clamp() if the arguments have the same signedness.")
and landed this.

35ba6bd582cf drm/bridge: ps8640: Fix size mismatch warning w/ len