From: Andy Lutomirski <luto@amacapital.net>
Date: Wed, 19 Nov 2014 21:56:19 +0000 (-0800)
Subject: x86, syscall: Fix _TIF_NOHZ handling in syscall_trace_enter_phase1
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~93^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5e212a3051b65e426a513901d9c7001681c7215;p=pandora-kernel.git

x86, syscall: Fix _TIF_NOHZ handling in syscall_trace_enter_phase1

TIF_NOHZ is 19 (i.e. _TIF_SYSCALL_TRACE | _TIF_NOTIFY_RESUME |
_TIF_SINGLESTEP), not (1<<19).

This code is involved in Dave's trinity lockup, but I don't see why
it would cause any of the problems he's seeing, except inadvertently
by causing a different path through entry_64.S's syscall handling.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Dave Jones <davej@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/a6cd3b60a3f53afb6e1c8081b0ec30ff19003dd7.1416434075.git.luto@amacapital.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

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