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ftrace: Unify effect of writing to trace_options and option/*

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"echo noglobal-clock > trace_options" can be used to change trace
clock but "echo 0 > options/global-clock" can't. The flag toggling
will be silently accepted without actually changing the clock callback.

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

Changelog:
v1->v2: Simplified switch() after Li Zefan <lizf@cn.fujitsu.com>'s
        suggestion

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Zhaolei 2009-08-07 18:55:48 +08:00 committed by Frederic Weisbecker
parent df4ecf1524
commit f2d84b65b9
1 changed files with 2 additions and 10 deletions
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12
kernel/trace/trace.c
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@ -3896,17 +3896,9 @@ trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
if (ret < 0)
return ret;
switch (val) {
case 0:
trace_flags &= ~(1 << index);
break;
case 1:
trace_flags |= 1 << index;
break;
default:
if (val != 0 && val != 1)
return -EINVAL;
}
set_tracer_flags(1 << index, val);
*ppos += cnt;