Re: [PATCH v3 1/6] iio: introduce IIO_DECLARE_BUFFER_WITH_TS macros

kernel test robot
2025-04-27T01:58:09Z

Hi David,

kernel test robot noticed the following build warnings:

[auto build test WARNING on aff301f37e220970c2f301b5c65a8bfedf52058e]

url: https://github.com/intel-lab-lkp/linux/commits/David-Lechner/iio-introduce-IIO_DECLARE_BUFFER_WITH_TS-macros/20250426-051240
base: aff301f37e220970c2f301b5c65a8bfedf52058e
patch link: https://lore.kernel.org/r/20250425-iio-introduce-iio_declare_buffer_with_ts-v3-1-f12df1bff248%40baylibre.com
patch subject: [PATCH v3 1/6] iio: introduce IIO_DECLARE_BUFFER_WITH_TS macros
config: i386-randconfig-r133-20250427 (https://download.01.org/0day-ci/archive/20250427/202504270919.3FGvikEj-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250427/202504270919.3FGvikEj-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202504270919.3FGvikEj-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
drivers/iio/accel/adxl313_core.c: note: in included file (through drivers/iio/accel/adxl313.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adxl345_core.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adxl355_core.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adxl313_spi.c: note: in included file (through drivers/iio/accel/adxl313.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adis16201.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adis16209.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/dmard09.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/da311.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adxl313_i2c.c: note: in included file (through drivers/iio/accel/adxl313.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adxl367_spi.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/da280.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/kxsd9.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/bma220_spi.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/kionix-kx022a.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adxl372.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/kxcjk-1013.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/fxls8962af-core.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adxl380.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/adxl367.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/mma7455_core.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/mc3230.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/ssp_accel_sensor.c: note: in included file (through include/linux/iio/common/ssp_sensors.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/mma7660.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/sca3300.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/mma9551.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/mma9551_core.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/mxc4005.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/stk8312.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/stk8ba50.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/sca3000.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/msa311.c: note: in included file (through include/linux/iio/buffer.h):
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"
--
drivers/iio/accel/mma9553.c: note: in included file:
>> include/linux/iio/iio.h:815:1: sparse: sparse: static assertion failed: "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment"

vim +815 include/linux/iio/iio.h

782
783 #define __IIO_DECLARE_BUFFER_WITH_TS(type, name, count) \
784 static_assert(count); \
785 type name[ALIGN((count), sizeof(s64) / sizeof(type)) + sizeof(s64) / sizeof(type)]
786
787 /**
788 * IIO_DECLARE_BUFFER_WITH_TS() - Declare a buffer with timestamp
789 * @type: element type of the buffer
790 * @name: identifier name of the buffer
791 * @count: number of elements in the buffer
792 *
793 * Declares a buffer that is safe to use with iio_push_to_buffer_with_ts(). In
794 * addition to allocating enough space for @count elements of @type, it also
795 * allocates space for a s64 timestamp at the end of the buffer and ensures
796 * proper alignment of the timestamp.
797 */
798 #define IIO_DECLARE_BUFFER_WITH_TS(type, name, count) \
799 __IIO_DECLARE_BUFFER_WITH_TS(type, name, count) __aligned(sizeof(s64))
800
801 /**
802 * IIO_DECLARE_DMA_BUFFER_WITH_TS() - Declare a DMA-aligned buffer with timestamp
803 * @type: element type of the buffer
804 * @name: identifier name of the buffer
805 * @count: number of elements in the buffer
806 *
807 * Same as IIO_DECLARE_BUFFER_WITH_TS(), but is uses __aligned(IIO_DMA_MINALIGN)
808 * to ensure that the buffer doesn't share cachelines with anything that comes
809 * before it in a struct. This should not be used for stack-allocated buffers
810 * as stack memory cannot generally be used for DMA.
811 */
812 #define IIO_DECLARE_DMA_BUFFER_WITH_TS(type, name, count) \
813 __IIO_DECLARE_BUFFER_WITH_TS(type, name, count) __aligned(IIO_DMA_MINALIGN)
814
> 815 static_assert(IIO_DMA_MINALIGN % sizeof(s64) == 0,
816 "macros above assume that IIO_DMA_MINALIGN also ensures s64 timestamp alignment");
817

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