[PATCH 3/8] x86_64,vsyscall: Turn vsyscalls all the way off when vsyscall=none

I see no point in having an unusable read-only page sitting at 0xff60 when vsyscall=none. Instead, skip mapping it and remove it from /proc/PID/maps. I kept the ratelimited warning when programs try to use a vsyscall in this mode, since it may help admins avoid confusion.

[PATCH 3/8] x86_64,vsyscall: Turn vsyscalls all the way off when vsyscall=none

I see no point in having an unusable read-only page sitting at 0xff60 when vsyscall=none. Instead, skip mapping it and remove it from /proc/PID/maps. I kept the ratelimited warning when programs try to use a vsyscall in this mode, since it may help admins avoid confusion.