drm/amd/pm: Replace one-element array with flexible-array in struct _ATOM_Vega10_GFXC...

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-one-element-arrays

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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 c934e96..9c479bd 100644 (file)
--- 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 {