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    Subject[PATCH 4.4 53/66] tracing: Apply trace_clock changes to instance max buffer
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Baohong Liu <baohong.liu@intel.com>

    commit 170b3b1050e28d1ba0700e262f0899ffa4fccc52 upstream.

    Currently trace_clock timestamps are applied to both regular and max
    buffers only for global trace. For instance trace, trace_clock
    timestamps are applied only to regular buffer. But, regular and max
    buffers can be swapped, for example, following a snapshot. So, for
    instance trace, bad timestamps can be seen following a snapshot.
    Let's apply trace_clock timestamps to instance max buffer as well.

    Link: http://lkml.kernel.org/r/ebdb168d0be042dcdf51f81e696b17fabe3609c1.1504642143.git.tom.zanussi@linux.intel.com

    Fixes: 277ba0446 ("tracing: Add interface to allow multiple trace buffers")
    Signed-off-by: Baohong Liu <baohong.liu@intel.com>
    Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    kernel/trace/trace.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/kernel/trace/trace.c
    +++ b/kernel/trace/trace.c
    @@ -5237,7 +5237,7 @@ static int tracing_set_clock(struct trac
    tracing_reset_online_cpus(&tr->trace_buffer);

    #ifdef CONFIG_TRACER_MAX_TRACE
    - if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer)
    + if (tr->max_buffer.buffer)
    ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func);
    tracing_reset_online_cpus(&tr->max_buffer);
    #endif

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