ftrace: Unify effect of writing to trace_options and option/*
authorZhaolei <zhaolei@cn.fujitsu.com>
Fri, 7 Aug 2009 10:55:48 +0000 (18:55 +0800)
committerFrederic Weisbecker <fweisbec@gmail.com>
Tue, 18 Aug 2009 00:07:04 +0000 (02:07 +0200)
commitf2d84b65b9778e8a35dd904f7d3993f0a60c9756
tree472a349bcc647cdf99c55f832156492478734f99
parentdf4ecf1524c7793de3121b2d4e5fc6bcc0da3bfb
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. 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>
kernel/trace/trace.c