mirror of
https://github.com/ibm-s390-linux/s390-tools.git
synced 2026-08-05 02:14:52 +00:00
7bec672c7e
Otherwise, dracut skips modules that are "not hostonly", i.e. not used /
loaded on the system when running dracut to build an initrd.
Without the fix, zdev device auto configuration only works for device
types for which a device driver happened to be loaded when building an
initrd. Likewise for specifying rd.* boot options.
Hostonly mode is often the default in Linux distributions.
Make zdev device auto configuration work nonetheless without users
having to know about and tweak dracut modes for initrd generation.
On the typical sloppy hostonly mode, the code disables hostonly for
installing kernel modules. This covers building regular initrds, where zdev
device auto configuration should even work for device types, for which
device drivers were not loaded when an initrd was generated. This can
happen when new devices of new types are configured for a DPM logical
partition. Also, users could want to start using dracut cmdline options
rd.{dasd,zfcp,znet} for a device type that was not used when the initrd was
built.
The special strict hostonly mode is used by some kdump implementations. In
that case, hostonly remains in effect intentionally because only support
for the really required devices as determined by dracut module 95zdev-kdump
should be included in a kdump initrd due to the memory-constrained kdump
environment. Cf. commit 73c46a3056 ("zdev/dracut: fix kdump by only
activating required devices"), which also provides more references on
strict hostonly mode. Even for non-kdump cases, let strict hostonly mode be
effective here in 95zdev in case some future use case appears for this
special mode beyond kdump.
Github-ID: https://github.com/ibm-s390-linux/s390-tools/pull/158
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>