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Message-Id: <1249540058-5528-3-git-send-email-fweisbec@gmail.com>
Date: Thu, 6 Aug 2009 08:27:33 +0200
From: Frederic Weisbecker <fweisbec@...il.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: LKML <linux-kernel@...r.kernel.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Lai Jiangshan <laijs@...fujitsu.com>,
Li Zefan <lizf@...fujitsu.com>,
Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 2/7] tracing/function-graph-tracer: Drop the useless nmi protection
The function graph tracer used to have a protection against NMI
while entering a function entry tracing. But this is useless now,
this tracer is reentrant and the ring buffer supports the NMI tracing.
We can then drop this protection.
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
arch/x86/kernel/ftrace.c | 4 ----
1 files changed, 0 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index d94e1ea..8e96634 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -417,10 +417,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
unsigned long return_hooker = (unsigned long)
&return_to_handler;
- /* Nmi's are currently unsupported */
- if (unlikely(in_nmi()))
- return;
-
if (unlikely(atomic_read(¤t->tracing_graph_pause)))
return;
--
1.6.2.3
--
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