[GIT PULL v2] tracing: A couple of minor fixes

From: Steven Rostedt
Date: Mon Oct 21 2019 - 15:19:39 EST



Linus,

Two minor fixes:

- A race in perf trace initialization (missing mutexes)

- Minor fix to represent gfp_t in synthetic events as properly signed


Please pull the latest trace-v5.4-rc3-2 tree, which can be found at:


git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
trace-v5.4-rc3-2

Tag SHA1: e8c07438dfe315733667f93b15f866c45f8ce192
Head SHA1: 5dacd386363b9a286002740cfa0a16f3358ae990


Prateek Sood (1):
tracing: Fix race in perf_trace_buf initialization

Zhengjun Xing (1):
tracing: Fix "gfp_t" format for synthetic events

----
kernel/trace/trace_event_perf.c | 4 ++++
kernel/trace/trace_events_hist.c | 2 ++
2 files changed, 6 insertions(+)
---------------------------
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 0892e38ed6fb..a9dfa04ffa44 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -272,9 +272,11 @@ int perf_kprobe_init(struct perf_event *p_event, bool is_retprobe)
goto out;
}

+ mutex_lock(&event_mutex);
ret = perf_trace_event_init(tp_event, p_event);
if (ret)
destroy_local_trace_kprobe(tp_event);
+ mutex_unlock(&event_mutex);
out:
kfree(func);
return ret;
@@ -282,8 +284,10 @@ int perf_kprobe_init(struct perf_event *p_event, bool is_retprobe)

void perf_kprobe_destroy(struct perf_event *p_event)
{
+ mutex_lock(&event_mutex);
perf_trace_event_close(p_event);
perf_trace_event_unreg(p_event);
+ mutex_unlock(&event_mutex);

destroy_local_trace_kprobe(p_event->tp_event);
}
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 57648c5aa679..7482a1466ebf 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -679,6 +679,8 @@ static bool synth_field_signed(char *type)
{
if (str_has_prefix(type, "u"))
return false;
+ if (strcmp(type, "gfp_t") == 0)
+ return false;

return true;
}