ftrace: Fix breakage of set_ftrace_pid
Commit 4104d326b670 ("ftrace: Remove global function list and call function
directly") simplified the ftrace code by removing the global_ops list with a
new design. But this cleanup also broke the filtering of PIDs that are added
to the set_ftrace_pid file.
Add back the proper hooks to have pid filtering working once again.
Cc: stable@vger.kernel.org # 3.16+
Reported-by: Matt Fleming <matt@console-pimps.org>
Reported-by: Richard Weinberger <richard.weinberger@gmail.com>
Tested-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 1da6029..6cd8c0e 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -116,6 +116,7 @@
* SAVE_REGS. If another ops with this flag set is already registered
* for any of the functions that this ops will be registered for, then
* this ops will fail to register or set_filter_ip.
+ * PID - Is affected by set_ftrace_pid (allows filtering on those pids)
*/
enum {
FTRACE_OPS_FL_ENABLED = 1 << 0,
@@ -132,6 +133,7 @@
FTRACE_OPS_FL_MODIFYING = 1 << 11,
FTRACE_OPS_FL_ALLOC_TRAMP = 1 << 12,
FTRACE_OPS_FL_IPMODIFY = 1 << 13,
+ FTRACE_OPS_FL_PID = 1 << 14,
};
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -159,6 +161,7 @@
struct ftrace_ops *next;
unsigned long flags;
void *private;
+ ftrace_func_t saved_func;
int __percpu *disabled;
#ifdef CONFIG_DYNAMIC_FTRACE
int nr_trampolines;