systemd: dont spew hidepid mount errors for kernels < v5.8
Recent systemd started using ascii args to "hidepid=" mount options
for proc fs - unconditionally -- even though kernels older than v5.8
emit an error message on each attempt:
root@qemux86-64:~# cat /proc/version
Linux version 5.4.87-yocto-standard (oe-user@oe-host) (gcc version 10.2.0 (GCC)) #1 SMP PREEMPT Fri Jan 8 01:47:13 UTC 2021
root@qemux86-64:~# dmesg|grep proc:
[ 29.487995] proc: Bad value for 'hidepid'
[ 43.170571] proc: Bad value for 'hidepid'
[ 44.175615] proc: Bad value for 'hidepid'
[ 46.213300] proc: Bad value for 'hidepid'
root@qemux86-64:~#
Simply ignoring them as the systemd maintainer unconditionally says
is the resolution is clearly not acceptable, given the above.
Add a kernel version check to avoid calling mount with invalid args.
Further details are within the enclosed systemd commit.
Cc: Luca Boccassi <luca.boccassi@microsoft.com> Cc: Richard Purdie <richard.purdie@linuxfoundation.org> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
