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Commit 84bde62c authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Steven Rostedt
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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: default avatarSteven Rostedt <rostedt@goodmis.org>
parent fb5a613b

kernel/trace/ftrace.c

+15 −0
Original line number Diff line number Diff line
@@ -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;