linux-kernel - Re: [PATCH] iio: imu: st_lsm6dsx: fix build when CONFIG_IIO_TRIGGERED

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Message-ID: <20230108121540.461f4c0c@jic23-huawei>
Date:   Sun, 8 Jan 2023 12:15:40 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     linux-iio@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: imu: st_lsm6dsx: fix build when
 CONFIG_IIO_TRIGGERED_BUFFER=m

On Tue,  3 Jan 2023 15:03:48 +0200
Vladimir Oltean <vladimir.oltean@....com> wrote:

> The following kernel linkage error:
> 
> st_lsm6dsx_core.o: in function `st_lsm6dsx_sw_buffers_setup':
> st_lsm6dsx_core.c:2578: undefined reference to `devm_iio_triggered_buffer_setup_ext'
> 
> is caused by the fact that the object owning devm_iio_triggered_buffer_setup_ext()
> (drivers/iio/buffer/industrialio-triggered-buffer.o) is allowed to be
> built as module when its user (drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c)
> is built-in.
> 
> The st_lsm6dsx driver already has a "select IIO_BUFFER", so add another
> select for IIO_TRIGGERED_BUFFER, to make that option follow what is set
> for the st_lsm6dsx driver. This is similar to what other iio drivers do.
> 
> Fixes: 2cfb2180c3e8 ("iio: imu: st_lsm6dsx: introduce sw trigger support")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Applied to the fixes-togreg branch of iio.git and marked for stable.

Thanks,

Jonathan

> ---
>  drivers/iio/imu/st_lsm6dsx/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/Kconfig b/drivers/iio/imu/st_lsm6dsx/Kconfig
> index f6660847fb58..8c16cdacf2f2 100644
> --- a/drivers/iio/imu/st_lsm6dsx/Kconfig
> +++ b/drivers/iio/imu/st_lsm6dsx/Kconfig
> @@ -4,6 +4,7 @@ config IIO_ST_LSM6DSX
>  	tristate "ST_LSM6DSx driver for STM 6-axis IMU MEMS sensors"
>  	depends on (I2C || SPI || I3C)
>  	select IIO_BUFFER
> +	select IIO_TRIGGERED_BUFFER
>  	select IIO_KFIFO_BUF
>  	select IIO_ST_LSM6DSX_I2C if (I2C)
>  	select IIO_ST_LSM6DSX_SPI if (SPI_MASTER)