linux-kernel - drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calc_auto.c:121:6: warning: stack frame size (3296) exceeds limit (2048) in function 'mode_support_and_system

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Message-ID: <202106270755.Q05fL8nr-lkp@intel.com>
Date:   Sun, 27 Jun 2021 07:35:06 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calc_auto.c:121:6:
 warning: stack frame size (3296) exceeds limit (2048) in function
 'mode_support_and_system_configuration'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   625acffd7ae2c52898d249e6c5c39f348db0d8df
commit: d0a3ac549f389c1511a4df0d7638536305205d20 ubsan: enable for all*config builds
date:   6 months ago
config: powerpc-randconfig-r012-20210627 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 557b101ce714e39438ba1d39c4c50b03e12fcb96)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d0a3ac549f389c1511a4df0d7638536305205d20
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout d0a3ac549f389c1511a4df0d7638536305205d20
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calc_auto.c:26:
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dm_services.h:35:
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dm_services_types.h:29:
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/os_types.h:30:
   In file included from include/linux/kgdb.h:18:
   In file included from include/linux/atomic.h:7:
   In file included from arch/powerpc/include/asm/atomic.h:11:
   In file included from arch/powerpc/include/asm/cmpxchg.h:8:
   In file included from include/linux/bug.h:5:
   In file included from arch/powerpc/include/asm/bug.h:109:
   In file included from include/asm-generic/bug.h:20:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/bitops.h:32:
   In file included from arch/powerpc/include/asm/bitops.h:62:
   arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined]
   #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
           ^
   <built-in>:309:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
>> drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calc_auto.c:121:6: warning: stack frame size (3296) exceeds limit (2048) in function 'mode_support_and_system_configuration' [-Wframe-larger-than]
   void mode_support_and_system_configuration(struct dcn_bw_internal_vars *v)
        ^
   2 warnings generated.
--
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_mode_vba_30.c:27:
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dc.h:29:
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dc_types.h:32:
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/os_types.h:30:
   In file included from include/linux/kgdb.h:18:
   In file included from include/linux/atomic.h:7:
   In file included from arch/powerpc/include/asm/atomic.h:11:
   In file included from arch/powerpc/include/asm/cmpxchg.h:8:
   In file included from include/linux/bug.h:5:
   In file included from arch/powerpc/include/asm/bug.h:109:
   In file included from include/asm-generic/bug.h:20:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/bitops.h:32:
   In file included from arch/powerpc/include/asm/bitops.h:62:
   arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined]
   #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
           ^
   <built-in>:309:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_mode_vba_30.c:3052:10: warning: variable 'MaxUsedBW' set but not used [-Wunused-but-set-variable]
                   double MaxUsedBW = 0;
                          ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_mode_vba_30.c:1917:13: warning: stack frame size (4416) exceeds limit (2048) in function 'DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation' [-Wframe-larger-than]
   static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation(
               ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_mode_vba_30.c:3641:6: warning: stack frame size (4816) exceeds limit (2048) in function 'dml30_ModeSupportAndSystemConfigurationFull' [-Wframe-larger-than]
   void dml30_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
        ^
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_mode_vba_30.c:6679:13: warning: stack frame size (2112) exceeds limit (2048) in function 'UseMinimumDCFCLK' [-Wframe-larger-than]
   static void UseMinimumDCFCLK(
               ^
   5 warnings generated.


vim +/mode_support_and_system_configuration +121 drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calc_auto.c

5634fb6078dd9b Dmytro Laktyushkin 2017-06-15  120  
74c49c7ac14f3a Harry Wentland     2017-05-08 @121  void mode_support_and_system_configuration(struct dcn_bw_internal_vars *v)

:::::: The code at line 121 was first introduced by commit
:::::: 74c49c7ac14f3a7cc500be959709f3473a6a49e7 drm/amdgpu/display: Add calcs code for DCN

:::::: TO: Harry Wentland <harry.wentland@....com>
:::::: CC: Alex Deucher <alexander.deucher@....com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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