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].
Refactor the code according to the use of a flexible-array member in struct phm_ppt_v1_voltage_lookup_table, instead of a one-element array, and use the struct_size() helper to calculate the size for the allocation.
[1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length...
Build-tested-by: kernel test robot lkp@intel.com Link: https://lore.kernel.org/lkml/5f7d61df.jWrFfnjxGbjSkPOp%25lkp@intel.com/ Signed-off-by: Gustavo A. R. Silva gustavoars@kernel.org --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h | 2 +- .../drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c | 10 +++------- .../amd/pm/powerplay/hwmgr/vega10_processpptables.c | 10 +++------- 3 files changed, 7 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h index 923cc04e405a..e11298cdeb30 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h @@ -86,7 +86,7 @@ typedef struct phm_ppt_v1_voltage_lookup_record phm_ppt_v1_voltage_lookup_record
struct phm_ppt_v1_voltage_lookup_table { uint32_t count; - phm_ppt_v1_voltage_lookup_record entries[1]; /* Dynamically allocate count entries. */ + phm_ppt_v1_voltage_lookup_record entries[]; /* Dynamically allocate count entries. */ }; typedef struct phm_ppt_v1_voltage_lookup_table phm_ppt_v1_voltage_lookup_table;
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c index 5d8016cd1986..426655b9c678 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c @@ -157,7 +157,7 @@ static int get_vddc_lookup_table( uint32_t max_levels ) { - uint32_t table_size, i; + uint32_t i; phm_ppt_v1_voltage_lookup_table *table; phm_ppt_v1_voltage_lookup_record *record; ATOM_Tonga_Voltage_Lookup_Record *atom_record; @@ -165,12 +165,8 @@ static int get_vddc_lookup_table( PP_ASSERT_WITH_CODE((0 != vddc_lookup_pp_tables->ucNumEntries), "Invalid CAC Leakage PowerPlay Table!", return 1);
- table_size = sizeof(uint32_t) + - sizeof(phm_ppt_v1_voltage_lookup_record) * max_levels; - - table = kzalloc(table_size, GFP_KERNEL); - - if (NULL == table) + table = kzalloc(struct_size(table, entries, max_levels), GFP_KERNEL); + if (!table) return -ENOMEM;
table->count = vddc_lookup_pp_tables->ucNumEntries; diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c index 4f6a73a2cf28..3d7f915381c8 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c @@ -1040,18 +1040,14 @@ static int get_vddc_lookup_table( const ATOM_Vega10_Voltage_Lookup_Table *vddc_lookup_pp_tables, uint32_t max_levels) { - uint32_t table_size, i; + uint32_t i; phm_ppt_v1_voltage_lookup_table *table;
PP_ASSERT_WITH_CODE((vddc_lookup_pp_tables->ucNumEntries != 0), "Invalid SOC_VDDD Lookup Table!", return 1);
- table_size = sizeof(uint32_t) + - sizeof(phm_ppt_v1_voltage_lookup_record) * max_levels; - - table = kzalloc(table_size, GFP_KERNEL); - - if (table == NULL) + table = kzalloc(struct_size(table, entries, max_levels), GFP_KERNEL); + if (!table) return -ENOMEM;
table->count = vddc_lookup_pp_tables->ucNumEntries;