linux-kernel - Re: [PATCH] drm/tiny: fix printk format string for 32-bit

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Message-ID: <05EAF4F2-7DFB-4C80-8D2A-054BCD7A126D@live.com>
Date: Tue, 4 Mar 2025 14:46:10 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: Arnd Bergmann <arnd@...nel.org>
CC: Aun-Ali Zaidi <admin@...eit.net>, 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>, Jani Nikula <jani.nikula@...el.com>, Atharva
 Tiwari <evepolonium@...il.com>, Kerem Karabay <kekrby@...il.com>, Arnd
 Bergmann <arnd@...db.de>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH] drm/tiny: fix printk format string for 32-bit

Hi

> On 4 Mar 2025, at 7:57 PM, Arnd Bergmann <arnd@...nel.org> wrote:
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> A size_t must be printed with the %z modifier instead of %l:
> 
> In file included from include/linux/device.h:15,
>                 from include/linux/usb.h:19,
>                 from drivers/gpu/drm/tiny/appletbdrm.c:19:
> drivers/gpu/drm/tiny/appletbdrm.c: In function 'appletbdrm_send_request':
> include/drm/drm_print.h:589:54: error: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
> drivers/gpu/drm/tiny/appletbdrm.c:170:17: note: in expansion of macro 'drm_err'
>  170 |                 drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
>      |                 ^~~~~~~
> drivers/gpu/drm/tiny/appletbdrm.c: In function 'appletbdrm_read_response':
> include/drm/drm_print.h:589:54: error: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
> drivers/gpu/drm/tiny/appletbdrm.c:211:17: note: in expansion of macro 'drm_err'
>  211 |                 drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
>      |                 ^~~~~~~
> 
> Fixes: 0670c2f56e45 ("drm/tiny: add driver for Apple Touch Bars in x86 Macs")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> —

Its the duplicate of:

https://lore.kernel.org/dri-devel/20250304-appletbdrm-fix-size_t-specifier-v1-1-94fe1d2c91f8@kernel.org/

as well as

https://lore.kernel.org/dri-devel/20250304135456.429407-1-jani.nikula@intel.com/