From: Chris Metcalf <cmetcalf@ezchip.com>
Date: Mon, 23 Mar 2015 18:23:58 +0000 (-0400)
Subject: tile: support CONTEXT_TRACKING and thus NOHZ_FULL
X-Git-Tag: omap-for-v4.1/fixes-rc1~110^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49e4e15619cd7cd9fc275d460fae2a95c1337fcc;p=pandora-kernel.git

tile: support CONTEXT_TRACKING and thus NOHZ_FULL

Add the TIF_NOHZ flag appropriately.

Add call to user_exit() on entry to do_work_pending() and on entry
to syscalls via do_syscall_trace_enter(), and also the top of
do_syscall_trace_exit() just because it's done in x86.

Add call to user_enter() at the bottom of do_work_pending() once we
have no more work to do before returning to userspace.

Wrap all the trap code in exception_enter() / exception_exit().

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
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