mdadm: re-add mdadm-ptest to PTESTS_SLOW

The ptest problems reported in e21021dc00ec ("mdadm: drop from PTESTS_SLOW")
should now be fixed, so mdadm can be added back to PTESTS_SLOW (a qemux86-64
test run takes about ~12 minutes to execute with kvm).

root@qemux86-64:~# ptest-runner mdadm
START: ptest-runner
2023-06-30T08:25
BEGIN: /usr/lib/mdadm/ptest
PASS: /usr/lib/mdadm/ptest/tests/00linear
PASS: /usr/lib/mdadm/ptest/tests/00multipath
...
PASS: /usr/lib/mdadm/ptest/tests/19repair-does-not-destroy
PASS: /usr/lib/mdadm/ptest/tests/20raid5journal
PASS: /usr/lib/mdadm/ptest/tests/21raid5cache
DURATION: 723
END: /usr/lib/mdadm/ptest
2023-06-30T09:16
STOP: ptest-runner
TOTAL: 1 FAIL: 0

For the testcases to run correctly, there must be enough rootfs space to create
13 loop devices. Similar to strace and lttng-tools, add a new
IMAGE_ROOTFS_EXTRA_SPACE entry for mdadm-ptest.

(From OE-Core rev: dfefff63c547adb1add0c8e3a308b2d0bd6cfc8c)

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/distro/include/ptest-packagelists.inc

@@ -99,6 +99,7 @@ PTESTS_SLOW = "\
     libgcrypt \
     libmodule-build-perl \
     lttng-tools \
+    mdadm \
     openssh \
     openssl \
     parted \
@@ -122,7 +123,6 @@ PTESTS_PROBLEMS:append:x86 = " valgrind"
 #    rt-tests \ # Needs to be checked whether it runs at all
 #    bash \ # Test outcomes are non-deterministic by design
 #    ifupdown \ # Tested separately in lib/oeqa/selftest/cases/imagefeatures.py
-#    mdadm \ # Tests rely on non-deterministic sleep() amounts
 #    libinput \ # Tests need an unloaded system to be reliable
 #    libpam \ # Needs pam DISTRO_FEATURE
 #    numactl \ # qemu not (yet) configured for numa; all tests are skipped
@@ -134,7 +134,6 @@ PTESTS_PROBLEMS = "\
     rt-tests \
     bash \
     ifupdown \
-    mdadm \
     libinput \
     libpam \
     libseccomp \

meta/recipes-core/images/core-image-ptest.bb

@@ -19,6 +19,7 @@ BBCLASSEXTEND = "${@' '.join(['mcextend:'+x for x in d.getVar('PTESTS').split()]
 # strace-ptest in particular needs more than 500MB
 IMAGE_OVERHEAD_FACTOR = "1.0"
 IMAGE_ROOTFS_EXTRA_SPACE = "324288"
+IMAGE_ROOTFS_EXTRA_SPACE:virtclass-mcextend-mdadm = "1524288"
 IMAGE_ROOTFS_EXTRA_SPACE:virtclass-mcextend-strace = "1024288"
 IMAGE_ROOTFS_EXTRA_SPACE:virtclass-mcextend-lttng-tools = "1524288"