diff mbox series

[v4,4/6] iio: buffer-dma: reduce the type of block.size to u32

Message ID 20210217073638.21681-5-alexandru.ardelean@analog.com (mailing list archive)
State New
Headers show
Series iio: core: Add mmap interface infrastructure | expand

Commit Message

Alexandru Ardelean Feb. 17, 2021, 7:36 a.m. UTC
The type of the 'size' parameter in the block struct is size_t which is
64 bit wide on 64 bit archs.
When the mmap interface gets introduced, we will use a 32 bit field in the
block descriptor for the block size, which will cause some compiler-checks
to fail.

32 bits (4 GB) block sizes should be enough. The idea is to allocate more
blocks if the size of a block grows to 4 GB.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/buffer/industrialio-buffer-dmaengine.c | 6 +++---
 include/linux/iio/buffer-dma.h                     | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
index d76179878ff9..19fbe5d9ef5b 100644
--- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
+++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
@@ -35,8 +35,8 @@  struct dmaengine_buffer {
 	struct dma_chan *chan;
 	struct list_head active;
 
-	size_t align;
-	size_t max_size;
+	u32 align;
+	u32 max_size;
 };
 
 static struct dmaengine_buffer *iio_buffer_to_dmaengine_buffer(
@@ -136,7 +136,7 @@  static ssize_t iio_dmaengine_buffer_get_length_align(struct device *dev,
 	struct dmaengine_buffer *dmaengine_buffer =
 		iio_buffer_to_dmaengine_buffer(buffer);
 
-	return sprintf(buf, "%zu\n", dmaengine_buffer->align);
+	return sprintf(buf, "%u\n", dmaengine_buffer->align);
 }
 
 static IIO_DEVICE_ATTR(length_align_bytes, 0444,
diff --git a/include/linux/iio/buffer-dma.h b/include/linux/iio/buffer-dma.h
index 6564bdcdac66..9de27d23e791 100644
--- a/include/linux/iio/buffer-dma.h
+++ b/include/linux/iio/buffer-dma.h
@@ -55,7 +55,7 @@  struct iio_dma_buffer_block {
 	 */
 	void *vaddr;
 	dma_addr_t phys_addr;
-	size_t size;
+	u32 size;
 	struct iio_dma_buffer_queue *queue;
 
 	/* Must not be accessed outside the core. */