On Aug 3, 2021, at 6:59 AM, Thomas Huth [off-list ref] wrote:

There is an endianess problem with /proc/sys/fs/nfs/nsm_use_hostnames
(which can e.g. be seen on an s390x host) :

# modprobe lockd nsm_use_hostnames=1
# cat /proc/sys/fs/nfs/nsm_use_hostnames
16777216

The nsm_use_hostnames variable is declared as "bool" which is required
for the correct type for the module parameter. However, this does not
work correctly with the entry in the /proc filesystem since this
currently requires "int".

Jia He already provided patches for this problem a couple of years ago,
but apparently they felt through the cracks and never got merged. So
here's a rebased version to finally fix this issue.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1764075

Jia He (2):
 sysctl: introduce new proc handler proc_dobool
 lockd: change the proc_handler for nsm_use_hostnames

fs/lockd/svc.c         |  2 +-
include/linux/sysctl.h |  2 ++
kernel/sysctl.c        | 42 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 45 insertions(+), 1 deletion(-)

-- 
2.27.0

To get these patches in front of our zero-day apparatus,
I've applied them to the for-next topic branch here:

https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git/log/?h=for-next

However I haven't seen an Ack for the kernel/sysctl.c change yet.


--
Chuck Lever