On Wed, 7 Jan 2026 09:33:12 -0600
John Groves <John@Groves.net> wrote:
> Save the kva from memremap because we need it for iomap rw support.
>
> Prior to famfs, there were no iomap users of /dev/dax - so the virtual
> address from memremap was not needed.
>
> (also fill in missing kerneldoc comment fields for struct dev_dax)
Do that as a precursor that can be picked up ahead of the rest of the series.
>
> Signed-off-by: John Groves <john@groves.net>
> ---
> drivers/dax/dax-private.h | 4 ++++
> drivers/dax/fsdev.c | 1 +
> 2 files changed, 5 insertions(+)
>
> diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
> index 0867115aeef2..1bb1631af485 100644
> --- a/drivers/dax/dax-private.h
> +++ b/drivers/dax/dax-private.h
> @@ -69,18 +69,22 @@ struct dev_dax_range {
> * data while the device is activated in the driver.
> * @region - parent region
> * @dax_dev - core dax functionality
> + * @virt_addr - kva from memremap; used by fsdev_dax
> + * @align - alignment of this instance
> * @target_node: effective numa node if dev_dax memory range is onlined
> * @dyn_id: is this a dynamic or statically created instance
> * @id: ida allocated id when the dax_region is not static
> * @ida: mapping id allocator
> * @dev - device core
> * @pgmap - pgmap for memmap setup / lifetime (driver owned)
> + * @memmap_on_memory - allow kmem to put the memmap in the memory
> * @nr_range: size of @ranges
> * @ranges: range tuples of memory used
> */
> struct dev_dax {
> struct dax_region *region;
> struct dax_device *dax_dev;
> + void *virt_addr;
> unsigned int align;
> int target_node;
> bool dyn_id;
> diff --git a/drivers/dax/fsdev.c b/drivers/dax/fsdev.c
> index 2a3249d1529c..c5c660b193e5 100644
> --- a/drivers/dax/fsdev.c
> +++ b/drivers/dax/fsdev.c
> @@ -235,6 +235,7 @@ static int fsdev_dax_probe(struct dev_dax *dev_dax)
> pr_debug("%s: offset detected phys=%llx pgmap_phys=%llx offset=%llx\n",
> __func__, phys, pgmap_phys, data_offset);
> }
> + dev_dax->virt_addr = addr + data_offset;
>
> inode = dax_inode(dax_dev);
> cdev = inode->i_cdev;