2021-09-27 12:22:48

by Arnd Bergmann

[permalink] [raw]
Subject: [PATCH] gpu: amd: replace open-coded offsetof() with builtin

From: Arnd Bergmann <[email protected]>

The two AMD drivers have their own custom offsetof() implementation
that now triggers a warning with recent versions of clang:

drivers/gpu/drm/radeon/radeon_atombios.c:133:14: error: performing pointer subtraction with a null pointer has undefined behavior [-Werror,-Wnull-pointer-subtraction]

Change all the instances to use the normal offsetof() provided
by the kernel that does not have this problem.

Signed-off-by: Arnd Bergmann <[email protected]>
---
drivers/gpu/drm/amd/display/dc/bios/command_table2.c | 4 +---
drivers/gpu/drm/amd/include/atombios.h | 2 +-
drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h | 4 ++--
drivers/gpu/drm/radeon/atombios.h | 2 +-
4 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
index f1f672a997d7..4f37be727332 100644
--- a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
@@ -44,9 +44,7 @@
bp->base.ctx->logger

#define GET_INDEX_INTO_MASTER_TABLE(MasterOrData, FieldName)\
- (((char *)(&((\
- struct atom_master_list_of_##MasterOrData##_functions_v2_1 *)0)\
- ->FieldName)-(char *)0)/sizeof(uint16_t))
+ (offsetof(struct atom_master_list_of_##MasterOrData##_functions_v2_1, FieldName) / sizeof(uint16_t))

#define EXEC_BIOS_CMD_TABLE(fname, params)\
(amdgpu_atom_execute_table(((struct amdgpu_device *)bp->base.ctx->driver_context)->mode_info.atom_context, \
diff --git a/drivers/gpu/drm/amd/include/atombios.h b/drivers/gpu/drm/amd/include/atombios.h
index 6a505d1b82a5..da895d1f3b4f 100644
--- a/drivers/gpu/drm/amd/include/atombios.h
+++ b/drivers/gpu/drm/amd/include/atombios.h
@@ -7148,7 +7148,7 @@ typedef struct _ATOM_ASIC_INTERNAL_SS_INFO_V3
#define GET_COMMAND_TABLE_COMMANDSET_REVISION(TABLE_HEADER_OFFSET) (((static_cast<ATOM_COMMON_TABLE_HEADER*>(TABLE_HEADER_OFFSET))->ucTableFormatRevision )&0x3F)
#define GET_COMMAND_TABLE_PARAMETER_REVISION(TABLE_HEADER_OFFSET) (((static_cast<ATOM_COMMON_TABLE_HEADER*>(TABLE_HEADER_OFFSET))->ucTableContentRevision)&0x3F)
#else // not __cplusplus
-#define GetIndexIntoMasterTable(MasterOrData, FieldName) (((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))
+#define GetIndexIntoMasterTable(MasterOrData, FieldName) (offsetof(ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES, FieldName) / sizeof(USHORT))

#define GET_COMMAND_TABLE_COMMANDSET_REVISION(TABLE_HEADER_OFFSET) ((((ATOM_COMMON_TABLE_HEADER*)TABLE_HEADER_OFFSET)->ucTableFormatRevision)&0x3F)
#define GET_COMMAND_TABLE_PARAMETER_REVISION(TABLE_HEADER_OFFSET) ((((ATOM_COMMON_TABLE_HEADER*)TABLE_HEADER_OFFSET)->ucTableContentRevision)&0x3F)
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h
index b7e2651b570b..2fc1733bcdcf 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h
@@ -29,9 +29,9 @@
typedef enum atom_smu9_syspll0_clock_id BIOS_CLKID;

#define GetIndexIntoMasterCmdTable(FieldName) \
- (((char*)(&((struct atom_master_list_of_command_functions_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))
+ (offsetof(struct atom_master_list_of_command_functions_v2_1, FieldName) / sizeof(uint16_t))
#define GetIndexIntoMasterDataTable(FieldName) \
- (((char*)(&((struct atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))
+ (offsetof(struct atom_master_list_of_data_tables_v2_1, FieldName) / sizeof(uint16_t))

#define PP_ATOMFWCTRL_MAX_VOLTAGE_ENTRIES 32

diff --git a/drivers/gpu/drm/radeon/atombios.h b/drivers/gpu/drm/radeon/atombios.h
index 83e8b8547f9b..bd5dc09e860f 100644
--- a/drivers/gpu/drm/radeon/atombios.h
+++ b/drivers/gpu/drm/radeon/atombios.h
@@ -5983,7 +5983,7 @@ typedef struct _ATOM_ASIC_INTERNAL_SS_INFO_V3
#define GET_COMMAND_TABLE_COMMANDSET_REVISION(TABLE_HEADER_OFFSET) (((static_cast<ATOM_COMMON_TABLE_HEADER*>(TABLE_HEADER_OFFSET))->ucTableFormatRevision )&0x3F)
#define GET_COMMAND_TABLE_PARAMETER_REVISION(TABLE_HEADER_OFFSET) (((static_cast<ATOM_COMMON_TABLE_HEADER*>(TABLE_HEADER_OFFSET))->ucTableContentRevision)&0x3F)
#else // not __cplusplus
-#define GetIndexIntoMasterTable(MasterOrData, FieldName) (((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))
+#define GetIndexIntoMasterTable(MasterOrData, FieldName) (offsetof(ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES, FieldName)/sizeof(USHORT))

#define GET_COMMAND_TABLE_COMMANDSET_REVISION(TABLE_HEADER_OFFSET) ((((ATOM_COMMON_TABLE_HEADER*)TABLE_HEADER_OFFSET)->ucTableFormatRevision)&0x3F)
#define GET_COMMAND_TABLE_PARAMETER_REVISION(TABLE_HEADER_OFFSET) ((((ATOM_COMMON_TABLE_HEADER*)TABLE_HEADER_OFFSET)->ucTableContentRevision)&0x3F)
--
2.29.2


2021-09-27 19:33:24

by Alex Deucher

[permalink] [raw]
Subject: Re: [PATCH] gpu: amd: replace open-coded offsetof() with builtin

Applied. Thanks!

Alex

On Mon, Sep 27, 2021 at 8:21 AM Arnd Bergmann <[email protected]> wrote:
>
> From: Arnd Bergmann <[email protected]>
>
> The two AMD drivers have their own custom offsetof() implementation
> that now triggers a warning with recent versions of clang:
>
> drivers/gpu/drm/radeon/radeon_atombios.c:133:14: error: performing pointer subtraction with a null pointer has undefined behavior [-Werror,-Wnull-pointer-subtraction]
>
> Change all the instances to use the normal offsetof() provided
> by the kernel that does not have this problem.
>
> Signed-off-by: Arnd Bergmann <[email protected]>
> ---
> drivers/gpu/drm/amd/display/dc/bios/command_table2.c | 4 +---
> drivers/gpu/drm/amd/include/atombios.h | 2 +-
> drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h | 4 ++--
> drivers/gpu/drm/radeon/atombios.h | 2 +-
> 4 files changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
> index f1f672a997d7..4f37be727332 100644
> --- a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
> +++ b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
> @@ -44,9 +44,7 @@
> bp->base.ctx->logger
>
> #define GET_INDEX_INTO_MASTER_TABLE(MasterOrData, FieldName)\
> - (((char *)(&((\
> - struct atom_master_list_of_##MasterOrData##_functions_v2_1 *)0)\
> - ->FieldName)-(char *)0)/sizeof(uint16_t))
> + (offsetof(struct atom_master_list_of_##MasterOrData##_functions_v2_1, FieldName) / sizeof(uint16_t))
>
> #define EXEC_BIOS_CMD_TABLE(fname, params)\
> (amdgpu_atom_execute_table(((struct amdgpu_device *)bp->base.ctx->driver_context)->mode_info.atom_context, \
> diff --git a/drivers/gpu/drm/amd/include/atombios.h b/drivers/gpu/drm/amd/include/atombios.h
> index 6a505d1b82a5..da895d1f3b4f 100644
> --- a/drivers/gpu/drm/amd/include/atombios.h
> +++ b/drivers/gpu/drm/amd/include/atombios.h
> @@ -7148,7 +7148,7 @@ typedef struct _ATOM_ASIC_INTERNAL_SS_INFO_V3
> #define GET_COMMAND_TABLE_COMMANDSET_REVISION(TABLE_HEADER_OFFSET) (((static_cast<ATOM_COMMON_TABLE_HEADER*>(TABLE_HEADER_OFFSET))->ucTableFormatRevision )&0x3F)
> #define GET_COMMAND_TABLE_PARAMETER_REVISION(TABLE_HEADER_OFFSET) (((static_cast<ATOM_COMMON_TABLE_HEADER*>(TABLE_HEADER_OFFSET))->ucTableContentRevision)&0x3F)
> #else // not __cplusplus
> -#define GetIndexIntoMasterTable(MasterOrData, FieldName) (((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))
> +#define GetIndexIntoMasterTable(MasterOrData, FieldName) (offsetof(ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES, FieldName) / sizeof(USHORT))
>
> #define GET_COMMAND_TABLE_COMMANDSET_REVISION(TABLE_HEADER_OFFSET) ((((ATOM_COMMON_TABLE_HEADER*)TABLE_HEADER_OFFSET)->ucTableFormatRevision)&0x3F)
> #define GET_COMMAND_TABLE_PARAMETER_REVISION(TABLE_HEADER_OFFSET) ((((ATOM_COMMON_TABLE_HEADER*)TABLE_HEADER_OFFSET)->ucTableContentRevision)&0x3F)
> diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h
> index b7e2651b570b..2fc1733bcdcf 100644
> --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h
> +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomfwctrl.h
> @@ -29,9 +29,9 @@
> typedef enum atom_smu9_syspll0_clock_id BIOS_CLKID;
>
> #define GetIndexIntoMasterCmdTable(FieldName) \
> - (((char*)(&((struct atom_master_list_of_command_functions_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))
> + (offsetof(struct atom_master_list_of_command_functions_v2_1, FieldName) / sizeof(uint16_t))
> #define GetIndexIntoMasterDataTable(FieldName) \
> - (((char*)(&((struct atom_master_list_of_data_tables_v2_1*)0)->FieldName)-(char*)0)/sizeof(uint16_t))
> + (offsetof(struct atom_master_list_of_data_tables_v2_1, FieldName) / sizeof(uint16_t))
>
> #define PP_ATOMFWCTRL_MAX_VOLTAGE_ENTRIES 32
>
> diff --git a/drivers/gpu/drm/radeon/atombios.h b/drivers/gpu/drm/radeon/atombios.h
> index 83e8b8547f9b..bd5dc09e860f 100644
> --- a/drivers/gpu/drm/radeon/atombios.h
> +++ b/drivers/gpu/drm/radeon/atombios.h
> @@ -5983,7 +5983,7 @@ typedef struct _ATOM_ASIC_INTERNAL_SS_INFO_V3
> #define GET_COMMAND_TABLE_COMMANDSET_REVISION(TABLE_HEADER_OFFSET) (((static_cast<ATOM_COMMON_TABLE_HEADER*>(TABLE_HEADER_OFFSET))->ucTableFormatRevision )&0x3F)
> #define GET_COMMAND_TABLE_PARAMETER_REVISION(TABLE_HEADER_OFFSET) (((static_cast<ATOM_COMMON_TABLE_HEADER*>(TABLE_HEADER_OFFSET))->ucTableContentRevision)&0x3F)
> #else // not __cplusplus
> -#define GetIndexIntoMasterTable(MasterOrData, FieldName) (((char*)(&((ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES*)0)->FieldName)-(char*)0)/sizeof(USHORT))
> +#define GetIndexIntoMasterTable(MasterOrData, FieldName) (offsetof(ATOM_MASTER_LIST_OF_##MasterOrData##_TABLES, FieldName)/sizeof(USHORT))
>
> #define GET_COMMAND_TABLE_COMMANDSET_REVISION(TABLE_HEADER_OFFSET) ((((ATOM_COMMON_TABLE_HEADER*)TABLE_HEADER_OFFSET)->ucTableFormatRevision)&0x3F)
> #define GET_COMMAND_TABLE_PARAMETER_REVISION(TABLE_HEADER_OFFSET) ((((ATOM_COMMON_TABLE_HEADER*)TABLE_HEADER_OFFSET)->ucTableContentRevision)&0x3F)
> --
> 2.29.2
>