Re: drivers/gpu/drm/panel/panel-samsung-ld9040.c:240:12: warning: stack frame size (8344) exceeds limit (8192) in 'ld9040_prepare'

[David Lechner]

On 8/18/26 9:29 PM, kernel test robot wrote:
> Hi David,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   3a0dd7ba4f44cdc116d83712f61e7c1a95be3588
> commit: 700a281905f2a4ccf6f3b2d3cd6985e034b4b021 spi: add offload TX/RX streaming APIs

I fail to see how this commit could possibly be related to the compiler
warning in ld9040_prepare() below.

> date:   1 year, 6 months ago
> config: x86_64-randconfig-003-20260819 (https://download.01.org/0day-ci/archive/20260819/202608191043.9OK2y1fN-lkp@xxxxxxxxx/config)
> compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260819/202608191043.9OK2y1fN-lkp@xxxxxxxxx/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
> | Fixes: 700a281905f2 ("spi: add offload TX/RX streaming APIs")
> | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202608191043.9OK2y1fN-lkp@xxxxxxxxx/
> 
> All warnings (new ones prefixed by >>):
> 
>    In file included from <built-in>:3:
>    In file included from include/linux/compiler_types.h:171:
>    include/linux/compiler-clang.h:28:9: warning: '__SANITIZE_ADDRESS__' macro redefined [-Wmacro-redefined]
>       28 | #define __SANITIZE_ADDRESS__
>          |         ^
>    <built-in>:353:9: note: previous definition is here
>      353 | #define __SANITIZE_ADDRESS__ 1
>          |         ^
>>> 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)
>          |            ^
>    2 warnings generated.
> 
> 
> 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@xxxxxxxxxxx>
> :::::: CC: Thierry Reding <treding@xxxxxxxxxx>
> 
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki