RE: [PATCH] drm/radeon: replace 1-element arrays with flexible-array members

From: Deucher, Alexander
Date: Fri Oct 27 2023 - 13:56:00 EST

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> -----Original Message-----
> From: José Pekkarinen <jose.pekkarinen@xxxxxxxxxxx>
> Sent: Friday, October 27, 2023 12:59 PM
> To: Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Koenig, Christian
> <Christian.Koenig@xxxxxxx>; Pan, Xinhui <Xinhui.Pan@xxxxxxx>;
> skhan@xxxxxxxxxxxxxxxxxxx
> Cc: José Pekkarinen <jose.pekkarinen@xxxxxxxxxxx>; airlied@xxxxxxxxx;
> daniel@xxxxxxxx; amd-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-
> devel@xxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-kernel-
> mentees@xxxxxxxxxxxxxxxxxxxxxxxxx
> Subject: [PATCH] drm/radeon: replace 1-element arrays with flexible-array
> members
>
> Reported by coccinelle, the following patch will move the following 1 element
> arrays to flexible arrays.
>
> drivers/gpu/drm/radeon/atombios.h:5523:32-48: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:5545:32-48: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:5461:34-44: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:4447:30-40: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:4236:30-41: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7044:24-37: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7054:24-37: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7095:28-45: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7553:8-17: WARNING use flexible-array
> member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7559:8-17: WARNING use flexible-array
> member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:3896:27-37: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:5443:16-25: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:5454:34-43: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:4603:21-32: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:6299:32-44: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:4628:32-46: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:6285:29-39: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:4296:30-36: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:4756:28-36: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:4064:22-35: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7327:9-24: WARNING use flexible-array
> member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7332:32-53: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:6030:8-17: WARNING use flexible-array
> member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7362:26-41: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7369:29-44: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7349:24-32: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
> drivers/gpu/drm/radeon/atombios.h:7355:27-35: WARNING use flexible-
> array member instead
> (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-
> length-and-one-element-arrays)
>
> Signed-off-by: José Pekkarinen <jose.pekkarinen@xxxxxxxxxxx>

Please verify that changing these to variable sized arrays does not break any calculations based on the old size in the driver. More below.

> ---
> drivers/gpu/drm/radeon/atombios.h | 54 +++++++++++++++----------------
> 1 file changed, 27 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/atombios.h
> b/drivers/gpu/drm/radeon/atombios.h
> index 8a6621f1e82c..7fa1606be92c 100644
> --- a/drivers/gpu/drm/radeon/atombios.h
> +++ b/drivers/gpu/drm/radeon/atombios.h
> @@ -3893,7 +3893,7 @@ typedef struct _ATOM_GPIO_PIN_ASSIGNMENT
> typedef struct _ATOM_GPIO_PIN_LUT {
> ATOM_COMMON_TABLE_HEADER sHeader;
> - ATOM_GPIO_PIN_ASSIGNMENT asGPIO_Pin[1];
> + ATOM_GPIO_PIN_ASSIGNMENT asGPIO_Pin[];
> }ATOM_GPIO_PIN_LUT;
>
>
> /******************************************************************
> **********/
> @@ -4061,7 +4061,7 @@ typedef struct
> _ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT //usSrcDstTableOffset
> UCHAR ucNumberOfSrc;
> USHORT usSrcObjectID[1];
> UCHAR ucNumberOfDst;
> - USHORT usDstObjectID[1];
> + USHORT usDstObjectID[];
> }ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT;
>
>
> @@ -4233,7 +4233,7 @@ typedef struct
> _ATOM_CONNECTOR_DEVICE_TAG_RECORD
> ATOM_COMMON_RECORD_HEADER sheader;
> UCHAR ucNumberOfDevice;
> UCHAR ucReserved;
> - ATOM_CONNECTOR_DEVICE_TAG asDeviceTag[1]; //This Id is same as
> "ATOM_DEVICE_XXX_SUPPORT", 1 is only for allocation
> + ATOM_CONNECTOR_DEVICE_TAG asDeviceTag[]; //This Id is same as
> "ATOM_DEVICE_XXX_SUPPORT", 1 is only for allocation
> }ATOM_CONNECTOR_DEVICE_TAG_RECORD;
>
>
> @@ -4293,7 +4293,7 @@ typedef struct
> _ATOM_OBJECT_GPIO_CNTL_RECORD
> ATOM_COMMON_RECORD_HEADER sheader;
> UCHAR ucFlags; // Future expnadibility
> UCHAR ucNumberOfPins; // Number of GPIO pins used to
> control the object
> - ATOM_GPIO_PIN_CONTROL_PAIR asGpio[1]; // the real gpio pin pair
> determined by number of pins ucNumberOfPins
> + ATOM_GPIO_PIN_CONTROL_PAIR asGpio[]; // the real gpio pin pair
> determined by number of pins ucNumberOfPins
> }ATOM_OBJECT_GPIO_CNTL_RECORD;
>
> //Definitions for GPIO pin state
> @@ -4444,7 +4444,7 @@ typedef struct
> _ATOM_BRACKET_LAYOUT_RECORD
> UCHAR ucWidth;
> UCHAR ucConnNum;
> UCHAR ucReserved;
> - ATOM_CONNECTOR_LAYOUT_INFO asConnInfo[1];
> + ATOM_CONNECTOR_LAYOUT_INFO asConnInfo[];
> }ATOM_BRACKET_LAYOUT_RECORD;
>
>
> /******************************************************************
> **********/
> @@ -4600,7 +4600,7 @@ typedef struct _ATOM_I2C_VOLTAGE_OBJECT_V3
> UCHAR ucVoltageControlAddress;
> UCHAR ucVoltageControlOffset;
> ULONG ulReserved;
> - VOLTAGE_LUT_ENTRY asVolI2cLut[1]; // end with 0xff
> + VOLTAGE_LUT_ENTRY asVolI2cLut[]; // end with 0xff
> }ATOM_I2C_VOLTAGE_OBJECT_V3;
>
> // ATOM_I2C_VOLTAGE_OBJECT_V3.ucVoltageControlFlag
> @@ -4625,7 +4625,7 @@ typedef struct
> _ATOM_LEAKAGE_VOLTAGE_OBJECT_V3
> UCHAR ucLeakageEntryNum; // indicate the entry number of
> LeakageId/Voltage Lut table
> UCHAR ucReserved[2];
> ULONG ulMaxVoltageLevel;
> - LEAKAGE_VOLTAGE_LUT_ENTRY_V2 asLeakageIdLut[1];
> + LEAKAGE_VOLTAGE_LUT_ENTRY_V2 asLeakageIdLut[];
> }ATOM_LEAKAGE_VOLTAGE_OBJECT_V3;
>
>
> @@ -4753,7 +4753,7 @@ typedef struct _ATOM_POWER_SOURCE_INFO {
> ATOM_COMMON_TABLE_HEADER asHeader;
> UCHAR
> asPwrbehave[16];
> - ATOM_POWER_SOURCE_OBJECT asPwrObj[1];
> + ATOM_POWER_SOURCE_OBJECT asPwrObj[];
> }ATOM_POWER_SOURCE_INFO;
>
>
> @@ -5440,7 +5440,7 @@ typedef struct _ATOM_FUSION_SYSTEM_INFO_V2
> typedef struct _ATOM_I2C_DATA_RECORD {
> UCHAR ucNunberOfBytes; //Indicates how many
> bytes SW needs to write to the external ASIC for one block, besides to "Start"
> and "Stop"
> - UCHAR ucI2CData[1]; //I2C data in bytes,
> should be less than 16 bytes usually
> + UCHAR ucI2CData[]; //I2C data in bytes, should
> be less than 16 bytes usually
> }ATOM_I2C_DATA_RECORD;
>
>
> @@ -5451,14 +5451,14 @@ typedef struct
> _ATOM_I2C_DEVICE_SETUP_INFO
> UCHAR ucSSChipID; //SS chip being used
> UCHAR ucSSChipSlaveAddr; //Slave Address to
> set up this SS chip
> UCHAR ucNumOfI2CDataRecords; //number of data block
> - ATOM_I2C_DATA_RECORD asI2CData[1];
> + ATOM_I2C_DATA_RECORD asI2CData[];
> }ATOM_I2C_DEVICE_SETUP_INFO;
>
>
> //=================================================================
> =========================
> typedef struct _ATOM_ASIC_MVDD_INFO
> {
> ATOM_COMMON_TABLE_HEADER sHeader;
> - ATOM_I2C_DEVICE_SETUP_INFO asI2CSetup[1];
> + ATOM_I2C_DEVICE_SETUP_INFO asI2CSetup[];
> }ATOM_ASIC_MVDD_INFO;
>
>
> //=================================================================
> =========================
> @@ -5520,7 +5520,7 @@ typedef struct _ATOM_ASIC_INTERNAL_SS_INFO
> typedef struct _ATOM_ASIC_INTERNAL_SS_INFO_V2 {
> ATOM_COMMON_TABLE_HEADER sHeader;
> - ATOM_ASIC_SS_ASSIGNMENT_V2 asSpreadSpectrum[1];
> //this is point only.
> + ATOM_ASIC_SS_ASSIGNMENT_V2 asSpreadSpectrum[];
> //this is point only.
> }ATOM_ASIC_INTERNAL_SS_INFO_V2;
>
> typedef struct _ATOM_ASIC_SS_ASSIGNMENT_V3 @@ -5542,7 +5542,7 @@
> typedef struct _ATOM_ASIC_SS_ASSIGNMENT_V3 typedef struct
> _ATOM_ASIC_INTERNAL_SS_INFO_V3 {
> ATOM_COMMON_TABLE_HEADER sHeader;
> - ATOM_ASIC_SS_ASSIGNMENT_V3 asSpreadSpectrum[1];
> //this is pointer only.
> + ATOM_ASIC_SS_ASSIGNMENT_V3 asSpreadSpectrum[];
> //this is pointer only.
> }ATOM_ASIC_INTERNAL_SS_INFO_V3;
>
>
> @@ -6027,7 +6027,7 @@ typedef struct _ENABLE_SCALER_PARAMETERS
> UCHAR ucScaler; // ATOM_SCALER1, ATOM_SCALER2
> UCHAR ucEnable; // ATOM_SCALER_DISABLE or
> ATOM_SCALER_CENTER or ATOM_SCALER_EXPANSION
> UCHAR ucTVStandard; //
> - UCHAR ucPadding[1];
> + UCHAR ucPadding[];

This may actually be a 1 element array. It’s just padding at the end of the table.

> }ENABLE_SCALER_PARAMETERS;
> #define ENABLE_SCALER_PS_ALLOCATION ENABLE_SCALER_PARAMETERS
>
> @@ -6282,7 +6282,7 @@ typedef union
> _ATOM_MEMORY_SETTING_ID_CONFIG_ACCESS
>
> typedef struct _ATOM_MEMORY_SETTING_DATA_BLOCK{
> ATOM_MEMORY_SETTING_ID_CONFIG_ACCESS
> ulMemoryID;
> - ULONG
> aulMemData[1];
> + ULONG
> aulMemData[];
> }ATOM_MEMORY_SETTING_DATA_BLOCK;
>
>
> @@ -6296,7 +6296,7 @@ typedef struct _ATOM_INIT_REG_BLOCK{
> USHORT
> usRegIndexTblSize;
>
> //size of asRegIndexBuf
> USHORT
> usRegDataBlkSize;
>
> //size of
> ATOM_MEMORY_SETTING_DATA_BLOCK
> ATOM_INIT_REG_INDEX_FORMAT
> asRegIndexBuf[1];
> - ATOM_MEMORY_SETTING_DATA_BLOCK asRegDataBuf[1];
> + ATOM_MEMORY_SETTING_DATA_BLOCK asRegDataBuf[];
> }ATOM_INIT_REG_BLOCK;
>

This one needs special handling as you have multiple variable sized arrays.

> #define END_OF_REG_INDEX_BLOCK 0x0ffff @@ -7041,7 +7041,7 @@
> typedef struct _ATOM_DISP_OUT_INFO
> USHORT ptrTransmitterInfo;
> USHORT ptrEncoderInfo;
> ASIC_TRANSMITTER_INFO asTransmitterInfo[1];
> - ASIC_ENCODER_INFO asEncoderInfo[1];
> + ASIC_ENCODER_INFO asEncoderInfo[];

Same here.

> }ATOM_DISP_OUT_INFO;
>
> typedef struct _ATOM_DISP_OUT_INFO_V2
> @@ -7051,7 +7051,7 @@ typedef struct _ATOM_DISP_OUT_INFO_V2
> USHORT ptrEncoderInfo;
> USHORT ptrMainCallParserFar; // direct address of main parser call
> in VBIOS binary.
> ASIC_TRANSMITTER_INFO asTransmitterInfo[1];
> - ASIC_ENCODER_INFO asEncoderInfo[1];
> + ASIC_ENCODER_INFO asEncoderInfo[];

Same here.

> }ATOM_DISP_OUT_INFO_V2;
>
>
> @@ -7092,7 +7092,7 @@ typedef struct _ATOM_DISP_OUT_INFO_V3
> UCHAR ucCoreRefClkSource; // value of CORE_REF_CLK_SOURCE
> UCHAR ucDispCaps;
> UCHAR ucReserved[2];
> - ASIC_TRANSMITTER_INFO_V2 asTransmitterInfo[1]; // for alligment only
> + ASIC_TRANSMITTER_INFO_V2 asTransmitterInfo[]; // for alligment only
> }ATOM_DISP_OUT_INFO_V3;
>
> //ucDispCaps
> @@ -7324,12 +7324,12 @@ typedef struct
> _CLOCK_CONDITION_SETTING_ENTRY{
> USHORT usMaxClockFreq;
> UCHAR ucEncodeMode;
> UCHAR ucPhySel;
> - ULONG ulAnalogSetting[1];
> + ULONG ulAnalogSetting[];
> }CLOCK_CONDITION_SETTING_ENTRY;
>
> typedef struct _CLOCK_CONDITION_SETTING_INFO{
> USHORT usEntrySize;
> - CLOCK_CONDITION_SETTING_ENTRY asClkCondSettingEntry[1];
> + CLOCK_CONDITION_SETTING_ENTRY asClkCondSettingEntry[];
> }CLOCK_CONDITION_SETTING_INFO;
>
> typedef struct _PHY_CONDITION_REG_VAL{
> @@ -7346,27 +7346,27 @@ typedef struct _PHY_CONDITION_REG_VAL_V2{
> typedef struct _PHY_CONDITION_REG_INFO{
> USHORT usRegIndex;
> USHORT usSize;
> - PHY_CONDITION_REG_VAL asRegVal[1];
> + PHY_CONDITION_REG_VAL asRegVal[];
> }PHY_CONDITION_REG_INFO;
>
> typedef struct _PHY_CONDITION_REG_INFO_V2{
> USHORT usRegIndex;
> USHORT usSize;
> - PHY_CONDITION_REG_VAL_V2 asRegVal[1];
> + PHY_CONDITION_REG_VAL_V2 asRegVal[];
> }PHY_CONDITION_REG_INFO_V2;
>
> typedef struct _PHY_ANALOG_SETTING_INFO{
> UCHAR ucEncodeMode;
> UCHAR ucPhySel;
> USHORT usSize;
> - PHY_CONDITION_REG_INFO asAnalogSetting[1];
> + PHY_CONDITION_REG_INFO asAnalogSetting[];
> }PHY_ANALOG_SETTING_INFO;
>
> typedef struct _PHY_ANALOG_SETTING_INFO_V2{
> UCHAR ucEncodeMode;
> UCHAR ucPhySel;
> USHORT usSize;
> - PHY_CONDITION_REG_INFO_V2 asAnalogSetting[1];
> + PHY_CONDITION_REG_INFO_V2 asAnalogSetting[];
> }PHY_ANALOG_SETTING_INFO_V2;
>
> typedef struct _GFX_HAVESTING_PARAMETERS { @@ -7550,13 +7550,13
> @@ typedef struct _ATOM_TMDS_INFO typedef struct
> _ATOM_ENCODER_ANALOG_ATTRIBUTE {
> UCHAR ucTVStandard; //Same as TV standards defined above,
> - UCHAR ucPadding[1];
> + UCHAR ucPadding[];

This may actually be a 1 element array. It’s just padding at the end of the table.

> }ATOM_ENCODER_ANALOG_ATTRIBUTE;
>
> typedef struct _ATOM_ENCODER_DIGITAL_ATTRIBUTE {
> UCHAR ucAttribute; //Same as other digital encoder attributes defined
> above
> - UCHAR ucPadding[1];
> + UCHAR ucPadding[];

Same here.

Alex

> }ATOM_ENCODER_DIGITAL_ATTRIBUTE;
>
> typedef union _ATOM_ENCODER_ATTRIBUTE
> --
> 2.39.2

Next message: Thomas Gleixner: "Re: [PATCH 5/7] irqchip/renesas-rzg2l: cache registers on suspend/resume"
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In reply to: José Pekkarinen: "[PATCH] drm/radeon: replace 1-element arrays with flexible-array members"
Next in thread: José Pekkarinen: "Re: [PATCH] drm/radeon: replace 1-element arrays with flexible-array members"
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