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| author | Steven Rostedt <srostedt@redhat.com> | 2012-07-20 19:08:05 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-07-31 16:29:54 +0200 |
| commit | ea701f11da44b44907af226fe5a5f57d2f26eeb2 (patch) | |
| tree | bed777e80fb81b28903fe4a64cb90164e499a178 /kernel/trace/ftrace.c | |
| parent | ftrace: Only compile ftrace selftest if selftests are enabled (diff) | |
| download | linux-ea701f11da44b44907af226fe5a5f57d2f26eeb2.tar.xz linux-ea701f11da44b44907af226fe5a5f57d2f26eeb2.zip | |
ftrace: Add selftest to test function trace recursion protection
Add selftests to test the function tracing recursion protection actually
does work. It also tests if a ftrace_ops states it will perform its own
protection. Although, even if the ftrace_ops states it will protect itself,
the ftrace infrastructure may still provide protection if the arch does
not support all features or another ftrace_ops is registered.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index ad765b4ba426..528d997c7f99 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -111,6 +111,27 @@ static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip); #define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops) #endif +/** + * ftrace_nr_registered_ops - return number of ops registered + * + * Returns the number of ftrace_ops registered and tracing functions + */ +int ftrace_nr_registered_ops(void) +{ + struct ftrace_ops *ops; + int cnt = 0; + + mutex_lock(&ftrace_lock); + + for (ops = ftrace_ops_list; + ops != &ftrace_list_end; ops = ops->next) + cnt++; + + mutex_unlock(&ftrace_lock); + + return cnt; +} + /* * Traverse the ftrace_global_list, invoking all entries. The reason that we * can use rcu_dereference_raw() is that elements removed from this list |