linux-kernel - Re: drivers/gpu/drm/tiny/pixpaper.c:579:12: warning: stack frame size (20024) exceeds limit (8192) in 'pixpaper_panel_hw

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Message-ID: <20251225092927.4925c4d7@pumpkin>
Date: Thu, 25 Dec 2025 09:29:27 +0000
From: David Laight <david.laight.linux@...il.com>
To: kernel test robot <lkp@...el.com>
Cc: LiangCheng Wang <zaq14760@...il.com>, llvm@...ts.linux.dev,
 oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, Thomas
 Zimmermann <tzimmermann@...e.de>
Subject: Re: drivers/gpu/drm/tiny/pixpaper.c:579:12: warning: stack frame
 size (20024) exceeds limit (8192) in 'pixpaper_panel_hw_init'

On Thu, 25 Dec 2025 06:46:40 +0800
kernel test robot <lkp@...el.com> wrote:

> Hi LiangCheng,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   ccd1cdca5cd433c8a5dff78b69a79b31d9b77ee1
> commit: c9e70639f5915f2d084a0126e62fe53a52c29cea drm: tiny: Add support for Mayqueen Pixpaper e-ink panel
> date:   4 months ago
> config: x86_64-randconfig-013-20251225 (https://download.01.org/0day-ci/archive/20251225/202512250610.xyL5clTw-lkp@intel.com/config)
> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251225/202512250610.xyL5clTw-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202512250610.xyL5clTw-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/gpu/drm/tiny/pixpaper.c:579:12: warning: stack frame size (20024) exceeds limit (8192) in 'pixpaper_panel_hw_init' [-Wframe-larger-than]  
>      579 | static int pixpaper_panel_hw_init(struct pixpaper_panel *panel)
>          |            ^
>    1 warning generated.
> 
> 
> vim +/pixpaper_panel_hw_init +579 drivers/gpu/drm/tiny/pixpaper.c
> 
>    578	
>  > 579	static int pixpaper_panel_hw_init(struct pixpaper_panel *panel)  
>    580	{
>    581		struct pixpaper_error_ctx err = { .errno_code = 0 };
>    582	
>    583		gpiod_set_value_cansleep(panel->reset, 0);
>    584		msleep(50);
>    585		gpiod_set_value_cansleep(panel->reset, 1);
>    586		msleep(50);
>    587	
>    588		pixpaper_wait_for_panel(panel);
>    589	
>    590		pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_4D, &err);
>    591		pixpaper_send_data(panel, PIXPAPER_UNKNOWN_4D_CONFIG, &err);

Those two functions want marking noinline (all the time).

	David