This is a note to let you know that I've just added the patch titled iio: adc: ad7768-1: Fix alignment for DMA safety to the 5.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iio-adc-ad7768-1-fix-alignment-for-dma-safety.patch and it can be found in the queue-5.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a2cd3ba767729fbb767f879fad4999799a20aeb4 Author: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Date: Sun May 8 18:55:56 2022 +0100 iio: adc: ad7768-1: Fix alignment for DMA safety [ Upstream commit 211f810f8fae05c1f78e531b2b113ea1ab3d1ce7 ] ____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_DMA_MINALIGN definition. Update the comment to reflect that separate cachelines 'may' be required. Fixes: a5f8c7da3dbe ("iio: adc: Add AD7768-1 ADC basic support") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx> Link: https://lore.kernel.org/r/20220508175712.647246-17-jic23@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c index aa42ba759fa1..60f394da4640 100644 --- a/drivers/iio/adc/ad7768-1.c +++ b/drivers/iio/adc/ad7768-1.c @@ -163,7 +163,7 @@ struct ad7768_state { struct gpio_desc *gpio_sync_in; const char *labels[ARRAY_SIZE(ad7768_channels)]; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ union { @@ -173,7 +173,7 @@ struct ad7768_state { } scan; __be32 d32; u8 d8[2]; - } data ____cacheline_aligned; + } data __aligned(IIO_DMA_MINALIGN); }; static int ad7768_spi_reg_read(struct ad7768_state *st, unsigned int addr,