[kbuild-all] drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/processpptables.c:841:6: warning: performing pointer subtraction with a null pointer has undefined behavior

Wednesday, 21 July 2021

Hi Dave,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b
commit: 0c8d22fcae2f9590a07b000e1724f665820b77f7 Merge tag
'amd-drm-next-5.10-2020-09-03' of git://people.freedesktop.org/~agd5f/linux into
drm-next
date:   11 months ago
config: powerpc64-randconfig-r012-20210720 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project
c781eb153bfbd1b52b03efe34f56bbeccbb8aba6)
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 powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        #
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit...
        git remote add linus
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 0c8d22fcae2f9590a07b000e1724f665820b77f7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;

All warnings (new ones prefixed by >>):

   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/processpptables.c:23:
   In file included from drivers/gpu/drm/amd/amdgpu/../pm/inc/pp_debug.h:34:
   In file included from include/linux/kernel.h:12:
   In file included from include/linux/bitops.h:29:
   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>:310:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
...
>
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/processpptables.c:841:6: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]                                           
GetIndexIntoMasterTable(DATA, PowerPlayInfo),
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/processpptables.c:1089:5: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                            GetIndexIntoMasterTable(DATA, FirmwareInfo),
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   3 warnings generated.
--
   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu8_hwmgr.c:23:
   In file included from drivers/gpu/drm/amd/amdgpu/../pm/inc/pp_debug.h:34:
   In file included from include/linux/kernel.h:12:
   In file included from include/linux/bitops.h:29:
   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>:310:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
...
>
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu8_hwmgr.c:319:4: warning: performing
pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]                           
GetIndexIntoMasterTable(DATA, IntegratedSystemInfo),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu8_hwmgr.c:2044:5: warning: no
previous prototype for function 'smu8_init_function_pointers'
[-Wmissing-prototypes]
   int smu8_init_function_pointers(struct pp_hwmgr *hwmgr)
       ^
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu8_hwmgr.c:2044:1: note: declare
'static' if the function is not intended to be used outside of this translation
unit
   int smu8_init_function_pointers(struct pp_hwmgr *hwmgr)
   ^
   static 
   3 warnings generated.
--
   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/process_pptables_v1_0.c:23:
   In file included from drivers/gpu/drm/amd/amdgpu/../pm/inc/pp_debug.h:34:
   In file included from include/linux/kernel.h:12:
   In file included from include/linux/bitops.h:29:
   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>:310:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
...
>
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/process_pptables_v1_0.c:136:14: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]            int index = GetIndexIntoMasterTable(DATA,
PowerPlayInfo);
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   2 warnings generated.
--
   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:23:
   In file included from drivers/gpu/drm/amd/amdgpu/../pm/inc/pp_debug.h:34:
   In file included from include/linux/kernel.h:12:
   In file included from include/linux/bitops.h:29:
   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>:310:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:31:
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppevvmath.h:336:7: warning: variable
'X_LessThanOne' set but not used [-Wunused-but-set-variable]
           bool X_LessThanOne, Y_LessThanOne;
                ^
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppevvmath.h:336:22: warning: variable
'Y_LessThanOne' set but not used [-Wunused-but-set-variable]
           bool X_LessThanOne, Y_LessThanOne;
                               ^
...
>
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:145:5: warning: performing
pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]                                   
GetIndexIntoMasterTable(DATA, VRAM_Info), &size, &frev, &crev);
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:191:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                           GetIndexIntoMasterTable(COMMAND, DynamicMemorySettings),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:203:14: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
           int index = GetIndexIntoMasterTable(DATA, VoltageObjectInfo);
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:261:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                    GetIndexIntoMasterTable(COMMAND, ComputeMemoryClockParam),
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:308:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                           GetIndexIntoMasterTable(COMMAND, ComputeMemoryClockParam),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:329:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                           GetIndexIntoMasterTable(COMMAND, ComputeMemoryClockParam),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:359:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                    GetIndexIntoMasterTable(COMMAND, ComputeMemoryEnginePLL),
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:383:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                    GetIndexIntoMasterTable(COMMAND, ComputeMemoryEnginePLL),
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:420:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                    GetIndexIntoMasterTable(COMMAND, ComputeMemoryEnginePLL),
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:453:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                    GetIndexIntoMasterTable(COMMAND, ComputeMemoryEnginePLL),
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:490:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                           GetIndexIntoMasterTable(DATA, FirmwareInfo),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:610:5: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                                   GetIndexIntoMasterTable(DATA, GPIO_Pin_LUT),
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:678:6: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                                           GetIndexIntoMasterTable(DATA,
ASIC_ProfilingInfo),

^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:744:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                           GetIndexIntoMasterTable(COMMAND, ReadEfuseValue),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:765:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                           GetIndexIntoMasterTable(COMMAND, ReadEfuseValue),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:785:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                           GetIndexIntoMasterTable(COMMAND, ReadEfuseValue),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomctrl.c:806:4: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
                           GetIndexIntoMasterTable(COMMAND, ReadEfuseValue),
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))
--
   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:24:
   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:27:
   In file included from drivers/gpu/drm/amd/amdgpu/../pm/inc/hwmgr.h:26:
   In file included from include/linux/seq_file.h:7:
   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:12:
   In file included from include/linux/bitops.h:29:
   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>:310:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
...
>
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:60:8: warning: performing
pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]            idx =
GetIndexIntoMasterDataTable(voltageobject_info);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:34:74: note: expanded
from macro 'GetIndexIntoMasterDataTable'
           (((char*)(&((struct
atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:168:8: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
           idx = GetIndexIntoMasterDataTable(gpio_pin_lut);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:34:74: note: expanded
from macro 'GetIndexIntoMasterDataTable'
           (((char*)(&((struct
atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:258:8: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
           idx = GetIndexIntoMasterCmdTable(computegpuclockparam);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:32:80: note: expanded
from macro 'GetIndexIntoMasterCmdTable'
           (((char*)(&((struct
atom_master_list_of_command_functions_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:285:8: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
           idx = GetIndexIntoMasterDataTable(asic_profiling_info);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:34:74: note: expanded
from macro 'GetIndexIntoMasterDataTable'
           (((char*)(&((struct
atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:469:8: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
           idx = GetIndexIntoMasterDataTable(smu_info);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:34:74: note: expanded
from macro 'GetIndexIntoMasterDataTable'
           (((char*)(&((struct
atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:505:7: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
           ix = GetIndexIntoMasterCmdTable(getsmuclockinfo);
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:32:80: note: expanded
from macro 'GetIndexIntoMasterCmdTable'
           (((char*)(&((struct
atom_master_list_of_command_functions_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:594:7: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
           ix = GetIndexIntoMasterDataTable(firmwareinfo);
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:34:74: note: expanded
from macro 'GetIndexIntoMasterDataTable'
           (((char*)(&((struct
atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.c:626:7: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]
           ix = GetIndexIntoMasterDataTable(smc_dpm_info);
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:34:74: note: expanded
from macro 'GetIndexIntoMasterDataTable'
           (((char*)(&((struct
atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   9 warnings generated.
--
   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu7_hwmgr.c:23:
   In file included from drivers/gpu/drm/amd/amdgpu/../pm/inc/pp_debug.h:34:
   In file included from include/linux/kernel.h:12:
   In file included from include/linux/bitops.h:29:
   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>:310:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
...
>
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu7_hwmgr.c:3075:14: warning: performing
pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]            int index = GetIndexIntoMasterTable(DATA,
FirmwareInfo);
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../include/atombios.h:7133:132: note: expanded from macro
'GetIndexIntoMasterTable'
   #define   GetIndexIntoMasterTable(MasterOrData, FieldName)
(((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))

                                           ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu7_hwmgr.c:5207:5: warning: no
previous prototype for function 'smu7_init_function_pointers'
[-Wmissing-prototypes]
   int smu7_init_function_pointers(struct pp_hwmgr *hwmgr)
       ^
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu7_hwmgr.c:5207:1: note: declare
'static' if the function is not intended to be used outside of this translation
unit
   int smu7_init_function_pointers(struct pp_hwmgr *hwmgr)
   ^
   static 
   3 warnings generated.
--
   In file included from
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/vega10_processpptables.c:23:
   In file included from include/linux/module.h:12:
   In file included from include/linux/list.h:9:
   In file included from include/linux/kernel.h:12:
   In file included from include/linux/bitops.h:29:
   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>:310:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
...
>
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/vega10_processpptables.c:49:14: warning:
performing pointer subtraction with a null pointer has undefined behavior
[-Wnull-pointer-subtraction]            int index =
GetIndexIntoMasterDataTable(powerplayinfo);
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/ppatomfwctrl.h:34:74: note: expanded
from macro 'GetIndexIntoMasterDataTable'
           (((char*)(&((struct
atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))

^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/vega10_processpptables.c:1182:5:
warning: no previous prototype for function 'vega10_pp_tables_initialize'
[-Wmissing-prototypes]
   int vega10_pp_tables_initialize(struct pp_hwmgr *hwmgr)
       ^
   drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/vega10_processpptables.c:1182:1: note:
declare 'static' if the function is not intended to be used outside of this
translation unit
   int vega10_pp_tables_initialize(struct pp_hwmgr *hwmgr)
   ^
   static 
   3 warnings generated.
..

vim +841 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/processpptables.c

3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  826  
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  827  static const ATOM_PPLIB_POWERPLAYTABLE *get_powerplay_table(
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  828  				     struct pp_hwmgr *hwmgr)
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  829  {
cf17039f489d3d drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Eric Huang  
2016-05-31  830  	const void *table_addr = hwmgr->soft_pp_table;
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  831  	uint8_t frev, crev;
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  832  	uint16_t size;
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  833  
cf17039f489d3d drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Eric Huang  
2016-05-31  834  	if (!table_addr) {
741deade2a704a drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Alex Deucher
2018-09-13  835  		if (hwmgr->chip_id == CHIP_RAVEN) {
3b4ca9e6494d19 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Rex Zhu     
2017-08-24  836  			table_addr = &soft_dummy_pp_table[0];
3b4ca9e6494d19 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Rex Zhu     
2017-08-24  837  			hwmgr->soft_pp_table = &soft_dummy_pp_table[0];
3b4ca9e6494d19 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Rex Zhu     
2017-08-24  838  			hwmgr->soft_pp_table_size = sizeof(soft_dummy_pp_table);
3b4ca9e6494d19 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Rex Zhu     
2017-08-24  839  		} else {
b3892e2bb519fe drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Rex Zhu     
2018-03-26  840  			table_addr = smu_atom_get_data_table(hwmgr->adev,
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21 @841  					GetIndexIntoMasterTable(DATA, PowerPlayInfo),
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  842  					&size, &frev, &crev);
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  843  			hwmgr->soft_pp_table = table_addr;
cf17039f489d3d drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Eric Huang  
2016-05-31  844  			hwmgr->soft_pp_table_size = size;
cf17039f489d3d drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Eric Huang  
2016-05-31  845  		}
3b4ca9e6494d19 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Rex Zhu     
2017-08-24  846  	}
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  847  
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  848  	return (const ATOM_PPLIB_POWERPLAYTABLE *)table_addr;
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  849  }
3bace359149391 drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c Jammy Zhou  
2015-07-21  850  

:::::: The code at line 841 was first introduced by commit
:::::: 3bace359149391c6547cefe3bf729f365bcf3ef6 drm/amd/powerplay: add hardware manager
sub-component

:::::: TO: Jammy Zhou <Jammy.Zhou(a)amd.com&gt;
:::::: CC: Alex Deucher <alexander.deucher(a)amd.com&gt;

---
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[kbuild-all] drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/processpptables.c:841:6: warning: performing pointer subtraction with a null pointer has undefined behavior