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Message-Id: <20210927122105.942129-1-arnd@kernel.org>
Date: Mon, 27 Sep 2021 14:20:41 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Harry Wentland <harry.wentland@....com>,
Leo Li <sunpeng.li@....com>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>, Evan Quan <evan.quan@....com>
Cc: Arnd Bergmann <arnd@...db.de>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Randy Dunlap <rdunlap@...radead.org>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH] gpu: amd: replace open-coded offsetof() with builtin
From: Arnd Bergmann <arnd@...db.de>
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 <arnd@...db.de>
---
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
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