Merge tag 'trace-v4.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "This adds three fixes for the tracing code.

  The first is a bug when ftrace_dump_on_oops is triggered in atomic
  context and function graph tracer is the tracer that is being
  reported.

  The second fix is bad parsing of the trace_events from the kernel
  command line, where it would ignore specific events if the system name
  is used with defining the event(it enables all events within the
  system).

  The last one is a fix to the TRACE_DEFINE_ENUM(), where a check was
  missing to see if the ptr was incremented to the end of the string,
  but the loop increments it again and can miss the nul delimiter to
  stop processing"

* tag 'trace-v4.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Fix possible out of bounds memory access when parsing enums
  tracing: Fix incorrect enabling of trace events by boot cmdline
  tracing: Handle ftrace_dump() atomic context in graph_trace_open()

1 files changed, 6 insertions, 2 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 9cfea4c6d314..a51e79688455 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1308,15 +1308,19 @@ void graph_trace_open(struct trace_iterator *iter)
 {
         /* pid and depth on the last trace processed */
         struct fgraph_data *data;
+        gfp_t gfpflags;
         int cpu;
 
         iter->private = NULL;
 
-        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        /* We can be called in atomic context via ftrace_dump() */
+        gfpflags = (in_atomic() || irqs_disabled()) ? GFP_ATOMIC : GFP_KERNEL;
+
+        data = kzalloc(sizeof(*data), gfpflags);
         if (!data)
                 goto out_err;
 
-        data->cpu_data = alloc_percpu(struct fgraph_cpu_data);
+        data->cpu_data = alloc_percpu_gfp(struct fgraph_cpu_data, gfpflags);
         if (!data->cpu_data)
                 goto out_err_free;