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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: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-09-12 14:21:13 -04:00 committed by Steven Rostedt
parent fb5a613b4f
commit 84bde62ca4
1 changed files with 15 additions and 0 deletions
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15
kernel/trace/ftrace.c
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@ -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;