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_clock_array, 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-and-one-element-arrays Build-tested-by: kernel test robot <l...@intel.com> Link: https://lore.kernel.org/lkml/5f7c433f.zymd+yuivawihgve%25...@intel.com/ Signed-off-by: Gustavo A. R. Silva <gustavo...@kernel.org> --- drivers/gpu/drm/amd/pm/inc/hwmgr.h | 2 +- .../amd/pm/powerplay/hwmgr/process_pptables_v1_0.c | 11 ++++------- .../gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c | 7 +++---- .../amd/pm/powerplay/hwmgr/vega10_processpptables.c | 9 +++------ 4 files changed, 11 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/inc/hwmgr.h b/drivers/gpu/drm/amd/pm/inc/hwmgr.h index d68b547743e6..e84cff09af2d 100644 --- a/drivers/gpu/drm/amd/pm/inc/hwmgr.h +++ b/drivers/gpu/drm/amd/pm/inc/hwmgr.h @@ -91,7 +91,7 @@ struct phm_set_power_state_input { struct phm_clock_array { uint32_t count; - uint32_t values[1]; + uint32_t values[]; }; struct phm_clock_voltage_dependency_record { 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 b760f95e7fa7..52188f6cd150 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 @@ -318,19 +318,16 @@ static int get_valid_clk( phm_ppt_v1_clock_voltage_dependency_table const *clk_volt_pp_table ) { - uint32_t table_size, i; + uint32_t i; struct phm_clock_array *table; phm_ppt_v1_clock_voltage_dependency_record *dep_record; PP_ASSERT_WITH_CODE((0 != clk_volt_pp_table->count), "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(uint32_t) * clk_volt_pp_table->count; - - table = kzalloc(table_size, GFP_KERNEL); - - if (NULL == table) + table = kzalloc(struct_size(table, values, clk_volt_pp_table->count), + GFP_KERNEL); + if (!table) return -ENOMEM; table->count = (uint32_t)clk_volt_pp_table->count; diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c index d94a7d8e0587..d9bed4df6f65 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c @@ -404,12 +404,11 @@ static int get_valid_clk(struct pp_hwmgr *hwmgr, struct phm_clock_array **ptable, const struct phm_clock_voltage_dependency_table *table) { - unsigned long table_size, i; + unsigned long i; struct phm_clock_array *clock_table; - table_size = sizeof(unsigned long) + sizeof(unsigned long) * table->count; - clock_table = kzalloc(table_size, GFP_KERNEL); - if (NULL == clock_table) + clock_table = kzalloc(struct_size(clock_table, values, table->count), GFP_KERNEL); + if (!clock_table) return -ENOMEM; clock_table->count = (unsigned long)table->count; 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 f29af5ca0aa0..e655c04ccdfb 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c @@ -875,17 +875,14 @@ static int get_valid_clk( struct phm_clock_array **clk_table, const phm_ppt_v1_clock_voltage_dependency_table *clk_volt_pp_table) { - uint32_t table_size, i; + uint32_t i; struct phm_clock_array *table; PP_ASSERT_WITH_CODE(clk_volt_pp_table->count, "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(uint32_t) * clk_volt_pp_table->count; - - table = kzalloc(table_size, GFP_KERNEL); - + table = kzalloc(struct_size(table, values, clk_volt_pp_table->count), + GFP_KERNEL); if (!table) return -ENOMEM; -- 2.27.0 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
