tracing: Fix reset of time stamps during trace_clock changes
authorAlexander Z Lam <azl@google.com>
Sat, 3 Aug 2013 01:36:16 +0000 (18:36 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 15 Aug 2013 05:59:07 +0000 (22:59 -0700)
commite88512e77c0a22fc860cfb1100920cb1ca3705d3
tree8d49e533e06cca6498dc0ff9bda8f0f811c5b1bd
parent2fd821ee4dd784a940d6840ebc85ecc8d7b80744
tracing: Fix reset of time stamps during trace_clock changes

commit 9457158bbc0ee04ecef76862d73eecd8076e9c7b upstream.

Fixed two issues with changing the timestamp clock with trace_clock:

 - The global buffer was reset on instance clock changes. Change this to pass
   the correct per-instance buffer
 - ftrace_now() is used to set buf->time_start in tracing_reset_online_cpus().
   This was incorrect because ftrace_now() used the global buffer's clock to
   return the current time. Change this to use buffer_ftrace_now() which
   returns the current time for the correct per-instance buffer.

Also removed tracing_reset_current() because it is not used anywhere

Link: http://lkml.kernel.org/r/1375493777-17261-2-git-send-email-azl@google.com

Signed-off-by: Alexander Z Lam <azl@google.com>
Cc: Vaibhav Nagarnaik <vnagarnaik@google.com>
Cc: David Sharp <dhsharp@google.com>
Cc: Alexander Z Lam <lambchop468@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/trace/trace.c