From: Andy Lutomirski <luto@amacapital.net>
Date: Wed, 29 Oct 2014 21:33:45 +0000 (-0700)
Subject: x86_64, vsyscall: Turn vsyscalls all the way off when vsyscall==none
X-Git-Tag: omap-for-v3.19/fixes-rc1~152^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=87983c66bc02c9cd8e4a42e7924435145d52bb13;p=pandora-kernel.git

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
0xffffffffff600000 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.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/0dddbadc1d4e3bfbaf887938ff42afc97a7cc1f2.1414618407.git.luto@amacapital.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

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