On Wed, Feb 10, 2021 at 6:36 PM Gustavo A. R. Silva gustavoars@kernel.org wrote:
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2].
Use flexible-array member in struct _ATOM_Vega10_GFXCLK_Dependency_Table, instead of one-element array.
Also, this helps with the ongoing efforts to enable -Warray-bounds and fix the following warning:
drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/vega10_hwmgr.c: In function ‘vega10_get_pp_table_entry_callback_func’: drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/vega10_hwmgr.c:3113:30: warning: array subscript 4 is above array bounds of ‘ATOM_Vega10_GFXCLK_Dependency_Record[1]’ {aka ‘struct _ATOM_Vega10_GFXCLK_Dependency_Record[1]’} [-Warray-bounds] 3113 | gfxclk_dep_table->entries[4].ulClk; | ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
[1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.9/process/deprecated.html#zero-length-and...
Link: https://github.com/KSPP/linux/issues/79 Link: https://github.com/KSPP/linux/issues/109 Build-tested-by: kernel test robot lkp@intel.com Link: https://lore.kernel.org/lkml/6023ff3d.WY3sSCkGRQPdPlVo%25lkp@intel.com/ Signed-off-by: Gustavo A. R. Silva gustavoars@kernel.org
Applied. Thanks!
Alex
drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h index c934e9612c1b..9c479bd9a786 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h @@ -161,9 +161,9 @@ typedef struct _ATOM_Vega10_MCLK_Dependency_Record { } ATOM_Vega10_MCLK_Dependency_Record;
typedef struct _ATOM_Vega10_GFXCLK_Dependency_Table {
- UCHAR ucRevId;
- UCHAR ucNumEntries; /* Number of entries. */
- ATOM_Vega10_GFXCLK_Dependency_Record entries[1]; /* Dynamically allocate entries. */
UCHAR ucRevId;UCHAR ucNumEntries; /* Number of entries. */ATOM_Vega10_GFXCLK_Dependency_Record entries[]; /* Dynamically allocate entries. */} ATOM_Vega10_GFXCLK_Dependency_Table;
typedef struct _ATOM_Vega10_MCLK_Dependency_Table {
2.27.0
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