From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
____cacheline_aligned is an insufficient guarantee for non-coherent DMA
on platforms with 128 byte cachelines above L1. Switch to the updated
IIO_ALIGN definition.
Update the comment to reflect that DMA safety 'may' require separate
cachelines.
Fixes: 54e018da3141 ("iio:ad7266: Mark transfer buffer as __be16")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
drivers/iio/adc/ad7266.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
index c17d9b5fbaf6..54fdb8fbb6a2 100644
--- a/drivers/iio/adc/ad7266.c
+++ b/drivers/iio/adc/ad7266.c
@@ -37,15 +37,15 @@ struct ad7266_state {
struct gpio_desc *gpios[3];
/*
- * DMA (thus cache coherency maintenance) requires the
- * transfer buffers to live in their own cache lines.
+ * DMA (thus cache coherency maintenance) may require the
+ * transfer buffers live in their own cache lines.
* The buffer needs to be large enough to hold two samples (4 bytes) and
* the naturally aligned timestamp (8 bytes).
*/
struct {
__be16 sample[2];
s64 timestamp;
- } data ____cacheline_aligned;
+ } data __aligned(IIO_ALIGN);
};
static int ad7266_wakeup(struct ad7266_state *st)
--
2.36.0
