[PATCH] doc: announce behavior change for device NUMA node field

[Olivier Matz <olivier.matz@6wind.com>]

The dev->device.numa_node field is set by the bus driver for each device
it manages to indicate on which NUMA node this device lies.

When this information is unknown, the assigned value is not consistent
across the bus drivers. In v22.11, the value will be set to -1 in
this case.

Link: https://patches.dpdk.org/project/dpdk/patch/20211026090610.10823-1-houssem.bouhlel@6wind.com/

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 doc/guides/rel_notes/deprecation.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 4e5b23c53d..5f269bf527 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -125,3 +125,9 @@ Deprecation Notices
   applications should be updated to use the ``dmadev`` library instead,
   with the underlying HW-functionality being provided by the ``ioat`` or
   ``idxd`` dma drivers
+
+* bus: The ``dev->device.numa_node`` field is set by the bus driver for
+  each device it manages to indicate on which NUMA node this device
+  lies. When this information is unknown, the assigned value is not
+  consistent across the bus drivers. In v22.11, the value will be set
+  to -1 in this case.
-- 
2.30.2