linux-kernel - drivers/gpu/drm/panel/panel-samsung-ld9040.c:240:12: warning: stack frame size (8344) exceeds limit (8192) in 'ld9040

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Message-ID: <202512250407.8W7HmLYR-lkp@intel.com>
Date: Thu, 25 Dec 2025 04:41:20 +0800
From: kernel test robot <lkp@...el.com>
To: David Lechner <dlechner@...libre.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Nuno Sa <nuno.sa@...log.com>
Subject: drivers/gpu/drm/panel/panel-samsung-ld9040.c:240:12:
 warning: stack frame size (8344) exceeds limit (8192) in 'ld9040_prepare'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b927546677c876e26eba308550207c2ddf812a43
commit: 700a281905f2a4ccf6f3b2d3cd6985e034b4b021 spi: add offload TX/RX streaming APIs
date:   11 months ago
config: x86_64-randconfig-013-20251225 (https://download.01.org/0day-ci/archive/20251225/202512250407.8W7HmLYR-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/20251225/202512250407.8W7HmLYR-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/202512250407.8W7HmLYR-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/panel/panel-samsung-ld9040.c:240:12: warning: stack frame size (8344) exceeds limit (8192) in 'ld9040_prepare' [-Wframe-larger-than]
     240 | static int ld9040_prepare(struct drm_panel *panel)
         |            ^
   1 warning generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for FB_IOMEM_HELPERS
   Depends on [n]: HAS_IOMEM [=y] && FB_CORE [=n]
   Selected by [m]:
   - DRM_XE_DISPLAY [=y] && HAS_IOMEM [=y] && DRM [=y] && DRM_XE [=m] && DRM_XE [=m]=m [=m] && HAS_IOPORT [=y]


vim +/ld9040_prepare +240 drivers/gpu/drm/panel/panel-samsung-ld9040.c

ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  239  
099b3e8699322e drivers/gpu/drm/panel/panel-ld9040.c Ajay Kumar    2014-07-31 @240  static int ld9040_prepare(struct drm_panel *panel)
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  241  {
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  242  	struct ld9040 *ctx = panel_to_ld9040(panel);
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  243  	int ret;
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  244  
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  245  	ret = ld9040_power_on(ctx);
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  246  	if (ret < 0)
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  247  		return ret;
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  248  
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  249  	ld9040_init(ctx);
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  250  
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  251  	ret = ld9040_clear_error(ctx);
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  252  
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  253  	if (ret < 0)
8141028278c2ea drivers/gpu/drm/panel/panel-ld9040.c Ajay Kumar    2014-07-31  254  		ld9040_unprepare(panel);
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  255  
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  256  	return ret;
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  257  }
ff219937763253 drivers/gpu/drm/panel/panel-ld9040.c Andrzej Hajda 2014-03-26  258  

:::::: The code at line 240 was first introduced by commit
:::::: 099b3e8699322efb7229913d2c1651588205f182 drm/panel: ld9040: Add dummy prepare and unprepare routines

:::::: TO: Ajay Kumar <ajaykumar.rs@...sung.com>
:::::: CC: Thierry Reding <treding@...dia.com>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki