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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2014-09-12 14:21:13 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-09-12 20:48:43 -0400
commit84bde62ca4b49701190dbd953c1e04024860c1f5 (patch)
tree5926044131cf96bd75d3c7a8efa2ac7d2d5b26fd /kernel/trace
parentfb5a613b4f310d6d520daf295547ab35b0ac58a3 (diff)
ftrace: Add sanity check when unregistering last ftrace_ops
When the last ftrace_ops is unregistered, all the function records should have a zeroed flags value. Make sure that is the case when the last ftrace_ops is unregistered. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/ftrace.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index d325a1e76554..fb186b9ddf51 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2416,6 +2416,21 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
ftrace_run_update_code(command);
+ /*
+ * If there's no more ops registered with ftrace, run a
+ * sanity check to make sure all rec flags are cleared.
+ */
+ if (ftrace_ops_list == &ftrace_list_end) {
+ struct ftrace_page *pg;
+ struct dyn_ftrace *rec;
+
+ do_for_each_ftrace_rec(pg, rec) {
+ if (FTRACE_WARN_ON_ONCE(rec->flags))
+ pr_warn(" %pS flags:%lx\n",
+ (void *)rec->ip, rec->flags);
+ } while_for_each_ftrace_rec();
+ }
+
ops->old_hash.filter_hash = NULL;
ops->old_hash.notrace_hash = NULL;