Commit 4740974a authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
Browse files

ftrace: Add default recursion protection for function tracing 



As more users of the function tracer utility are being added, they do
not always add the necessary recursion protection. To protect from
function recursion due to tracing, if the callback ftrace_ops does not
specifically specify that it protects against recursion (by setting
the FTRACE_OPS_FL_RECURSION_SAFE flag), the list operation will be
called by the mcount trampoline which adds recursion protection.

If the flag is set, then the function will be called directly with no
extra protection.

Note, the list operation is called if more than one function callback
is registered, or if the arch does not support all of the function
tracer features.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 5767cfea

include/linux/ftrace.h

+5 −0
Original line number Diff line number Diff line
@@ -85,6 +85,10 @@ typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, 
 *            passing regs to the handler.

 *            Note, if this flag is set, the SAVE_REGS flag will automatically

 *            get set upon registering the ftrace_ops, if the arch supports it.

 * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure

 *            that the call back has its own recursion protection. If it does

 *            not set this, then the ftrace infrastructure will add recursion

 *            protection for the caller.

 */

enum {

	FTRACE_OPS_FL_ENABLED			= 1 << 0,
@@ -93,6 +97,7 @@ enum { 
	FTRACE_OPS_FL_CONTROL			= 1 << 3,

	FTRACE_OPS_FL_SAVE_REGS			= 1 << 4,

	FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED	= 1 << 5,

	FTRACE_OPS_FL_RECURSION_SAFE		= 1 << 6,

};



struct ftrace_ops {

kernel/trace/ftrace.c

+8 −2
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ 


static struct ftrace_ops ftrace_list_end __read_mostly = {

	.func		= ftrace_stub,

	.flags		= FTRACE_OPS_FL_RECURSION_SAFE,

};



/* ftrace_enabled is a method to turn ftrace on or off */
@@ -221,12 +222,13 @@ static void update_ftrace_function(void) 


	/*

	 * If we are at the end of the list and this ops is

	 * not dynamic and the arch supports passing ops, then have the

	 * mcount trampoline call the function directly.

	 * recursion safe and not dynamic and the arch supports passing ops,

	 * then have the mcount trampoline call the function directly.

	 */

	if (ftrace_ops_list == &ftrace_list_end ||

	    (ftrace_ops_list->next == &ftrace_list_end &&

	     !(ftrace_ops_list->flags & FTRACE_OPS_FL_DYNAMIC) &&

	     (ftrace_ops_list->flags & FTRACE_OPS_FL_RECURSION_SAFE) &&

	     !FTRACE_FORCE_LIST_FUNC)) {

		/* Set the ftrace_ops that the arch callback uses */

		if (ftrace_ops_list == &global_ops)
@@ -867,6 +869,7 @@ static void unregister_ftrace_profiler(void) 
#else

static struct ftrace_ops ftrace_profile_ops __read_mostly = {

	.func		= function_profile_call,

	.flags		= FTRACE_OPS_FL_RECURSION_SAFE,

};



static int register_ftrace_profiler(void)
@@ -1049,6 +1052,7 @@ static struct ftrace_ops global_ops = { 
	.func			= ftrace_stub,

	.notrace_hash		= EMPTY_HASH,

	.filter_hash		= EMPTY_HASH,

	.flags			= FTRACE_OPS_FL_RECURSION_SAFE,

};



static DEFINE_MUTEX(ftrace_regex_lock);
@@ -3967,6 +3971,7 @@ void __init ftrace_init(void) 


static struct ftrace_ops global_ops = {

	.func			= ftrace_stub,

	.flags			= FTRACE_OPS_FL_RECURSION_SAFE,

};



static int __init ftrace_nodyn_init(void)
@@ -4023,6 +4028,7 @@ ftrace_ops_control_func(unsigned long ip, unsigned long parent_ip, 


static struct ftrace_ops control_ops = {

	.func = ftrace_ops_control_func,

	.flags = FTRACE_OPS_FL_RECURSION_SAFE,

};



static inline void

kernel/trace/trace_events.c

+1 −0
Original line number Diff line number Diff line
@@ -1721,6 +1721,7 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip, 
static struct ftrace_ops trace_ops __initdata  =

{

	.func = function_test_events_call,

	.flags = FTRACE_OPS_FL_RECURSION_SAFE,

};



static __init void event_trace_self_test_with_function(void)

kernel/trace/trace_functions.c

+2 −2
Original line number Diff line number Diff line
@@ -153,13 +153,13 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip, 
static struct ftrace_ops trace_ops __read_mostly =

{

	.func = function_trace_call,

	.flags = FTRACE_OPS_FL_GLOBAL,

	.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,

};



static struct ftrace_ops trace_stack_ops __read_mostly =

{

	.func = function_stack_trace_call,

	.flags = FTRACE_OPS_FL_GLOBAL,

	.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,

};



/* Our two options */

kernel/trace/trace_irqsoff.c

+1 −1
Original line number Diff line number Diff line
@@ -154,7 +154,7 @@ irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip, 
static struct ftrace_ops trace_ops __read_mostly =

{

	.func = irqsoff_tracer_call,

	.flags = FTRACE_OPS_FL_GLOBAL,

	.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,

};

#endif /* CONFIG_FUNCTION_TRACER */

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