Why are the file perns of /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq much more rigide ?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

all other files in that directory are 644 , but that file has 400 ?

Kernel is v3.14

- --
MfG/Sincerely
Toralf Förster
pgp finger print:1A37 6F99 4A9D 026F 13E2 4DCF C4EA CDDE 0076 E94E -----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.22 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iF4EAREIAAYFAlM5v0IACgkQxOrN3gB26U4ubQD+OZ44f1hVY+Z7C/czsZ6sGCO0 emcg5ixJk4+oZgSptZgA/R+pjhr4msuknJNhLv0fO5SU3nv2PNRS6FBy8+uE5MUz =MhMg
-----END PGP SIGNATURE-----

https://bugzilla.kernel.org/show_bug.cgi?id=65611