linux-kernel - [PATCH 2/2] ftrace: Unify effect of writing to trace

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Date:	Thu, 06 Aug 2009 11:27:56 +0800
From:	Zhaolei <zhaolei@...fujitsu.com>
To:	Steven Rostedt <srostedt@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] ftrace: Unify effect of writing to trace_options and
 option/*

"echo noglobal-clock > trace_options" can be used to change trace
clock but "echo 0 > options/global-clock" can't.

We can fix it by using set_tracer_flags() in trace_options_core_write().

Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>
---
 kernel/trace/trace.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 464b7bb..2fa2bac 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3893,12 +3893,11 @@ trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
 
 	switch (val) {
 	case 0:
-		trace_flags &= ~(1 << index);
+		set_tracer_flags(1 << index, 0);
 		break;
 	case 1:
-		trace_flags |= 1 << index;
+		set_tracer_flags(1 << index, 1);
 		break;
-
 	default:
 		return -EINVAL;
 	}
-- 
1.5.5.3


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