[PATCH] drm/amd/pm: suppress compile warning about possible unaligned accesses

[Alex Deucher]

On Sat, May 7, 2022 at 3:06 AM Evan Quan <evan.quan at amd.com> wrote:
>
> Suppress the following compile warning:
>    In file included from drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_0_ppt.c:39:
> >> drivers/gpu/drm/amd/amdgpu/../pm/inc/smu_v13_0_0_pptable.h:194:39:
> warning: field overdrive_table within 'struct smu_13_0_0_powerplay_table' is
> less aligned than 'struct smu_13_0_0_overdrive_table' and is usually due to
> 'struct smu_13_0_0_powerplay_table' being packed,
> which can lead to unaligned accesses [-Wunaligned-access]
>
> Reported-by: kernel test robot <lkp at intel.com>
> Signed-off-by: Evan Quan <evan.quan at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> Change-Id: Ibba9dbfcc6440d0bdf0fbe0534ce6a82ab6d5d10
> ---
>  drivers/gpu/drm/amd/pm/inc/smu_v13_0_0_pptable.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/inc/smu_v13_0_0_pptable.h b/drivers/gpu/drm/amd/pm/inc/smu_v13_0_0_pptable.h
> index 670f2ef67868..566a0da59e53 100644
> --- a/drivers/gpu/drm/amd/pm/inc/smu_v13_0_0_pptable.h
> +++ b/drivers/gpu/drm/amd/pm/inc/smu_v13_0_0_pptable.h
> @@ -22,6 +22,8 @@
>  #ifndef SMU_13_0_0_PPTABLE_H
>  #define SMU_13_0_0_PPTABLE_H
>
> +#pragma pack(push, 1)
> +
>  #define SMU_13_0_0_TABLE_FORMAT_REVISION 15
>
>  //// POWERPLAYTABLE::ulPlatformCaps
> @@ -194,7 +196,8 @@ struct smu_13_0_0_powerplay_table
>      struct smu_13_0_0_overdrive_table overdrive_table;
>      uint8_t padding1;
>      PPTable_t smc_pptable; //PPTable_t in driver_if.h
> -} __attribute__((packed));
> +};
>
> +#pragma pack(pop)
>
>  #endif
> --
> 2.29.0
>