New sanity checks in sysctl_check_table() complain about a couple
of mode 0755 that should be 0555 in the perfmon code:
sysctl table check failed: /kernel .1 Writable sysctl directory
sysctl table check failed: /kernel/perfmon  Writable sysctl directory
Signed-off-by: Tony Luck <tony.luck@intel.com>
        {
                .ctl_name       = CTL_UNNUMBERED,
                .procname       = "perfmon",
-               .mode           = 0755,
+               .mode           = 0555,
                .child          = pfm_ctl_table,
        },
        {}
        {
                .ctl_name       = CTL_KERN,
                .procname       = "kernel",
-               .mode           = 0755,
+               .mode           = 0555,
                .child          = pfm_sysctl_dir,
        },
        {}