On Sun, Jan 18, 2026 at 10:36:02PM +0000, John Groves wrote:

quoted

From: John Groves <john@groves.net>

No change since V2 - re-sending due to technical challenges.

No change since V1 - reposting as V2 to keep this with the related
kernel (dax and fuse) patches and libfuse patches.

This short series adds support and tests to daxctl for famfs[1]. The
famfs kernel patch series, under the same "compound cover" as this
series, adds a new 'fsdev_dax' driver for devdax. When that driver
is bound (instead of device_dax), the device is in 'famfs' mode rather
than 'devdax' mode.

Hi John, 

I fired this all up and ran it. It got through all but it's last test
case before failing.

Three things appended:
1) the diff I applied to daxctl-famfs.sh to run the test
2) testlog.txt output of the test
3) RIP: 0010:is_free_buddy_page+0x39/0x60 kernel log


1) Diff I applied to execute the test:

diff --git a/test/daxctl-famfs.sh b/test/daxctl-famfs.sh
index 12fbfefa3144..a4e8d87b9762 100755
--- a/test/daxctl-famfs.sh
+++ b/test/daxctl-famfs.sh

@@ -9,6 +9,17 @@ rc=77
 
 trap 'cleanup $LINENO' ERR
 
+# Use cxl-test module to get the DAX device of the CXL auto region,
+# which also makes this test NON destructive.
+#
+# The $CXL list below is a delay because find_daxdev() was not
+# finding the DAX region without it.
+#
+modprobe -r cxl-test
+modprobe cxl-test
+$CXL list
+
+
 daxdev=""
 original_mode=""