From 0764d23cf066c52de42b653144605b481d3fbdbc Mon Sep 17 00:00:00 2001
From: Steven Rostedt <srostedt@redhat.com>
Date: Mon, 12 May 2008 21:20:44 +0200
Subject: [PATCH] ftrace: lockdep notrace annotations

Add notrace annotations to lockdep to keep ftrace from causing
recursive problems with lock tracing and debugging.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/lockdep.c  | 23 ++++++++++++-----------
 kernel/spinlock.c |  2 +-
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index e21924365ea..ac46847ba0c 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -271,14 +271,14 @@ static struct list_head chainhash_table[CHAINHASH_SIZE];
 	((key1) >> (64-MAX_LOCKDEP_KEYS_BITS)) ^ \
 	(key2))
 
-void lockdep_off(void)
+notrace void lockdep_off(void)
 {
 	current->lockdep_recursion++;
 }
 
 EXPORT_SYMBOL(lockdep_off);
 
-void lockdep_on(void)
+notrace void lockdep_on(void)
 {
 	current->lockdep_recursion--;
 }
@@ -1041,7 +1041,7 @@ find_usage_forwards(struct lock_class *source, unsigned int depth)
  * Return 1 otherwise and keep <backwards_match> unchanged.
  * Return 0 on error.
  */
-static noinline int
+static noinline notrace int
 find_usage_backwards(struct lock_class *source, unsigned int depth)
 {
 	struct lock_list *entry;
@@ -1591,7 +1591,7 @@ static inline int validate_chain(struct task_struct *curr,
  * We are building curr_chain_key incrementally, so double-check
  * it from scratch, to make sure that it's done correctly:
  */
-static void check_chain_key(struct task_struct *curr)
+static notrace void check_chain_key(struct task_struct *curr)
 {
 #ifdef CONFIG_DEBUG_LOCKDEP
 	struct held_lock *hlock, *prev_hlock = NULL;
@@ -1967,7 +1967,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
 /*
  * Mark all held locks with a usage bit:
  */
-static int
+static notrace int
 mark_held_locks(struct task_struct *curr, int hardirq)
 {
 	enum lock_usage_bit usage_bit;
@@ -2260,8 +2260,8 @@ static inline int separate_irq_context(struct task_struct *curr,
 /*
  * Mark a lock with a usage bit, and validate the state transition:
  */
-static int mark_lock(struct task_struct *curr, struct held_lock *this,
-		     enum lock_usage_bit new_bit)
+static notrace int mark_lock(struct task_struct *curr, struct held_lock *this,
+			     enum lock_usage_bit new_bit)
 {
 	unsigned int new_mask = 1 << new_bit, ret = 1;
 
@@ -2663,7 +2663,7 @@ __lock_release(struct lockdep_map *lock, int nested, unsigned long ip)
 /*
  * Check whether we follow the irq-flags state precisely:
  */
-static void check_flags(unsigned long flags)
+static notrace void check_flags(unsigned long flags)
 {
 #if defined(CONFIG_DEBUG_LOCKDEP) && defined(CONFIG_TRACE_IRQFLAGS)
 	if (!debug_locks)
@@ -2700,8 +2700,8 @@ static void check_flags(unsigned long flags)
  * We are not always called with irqs disabled - do that here,
  * and also avoid lockdep recursion:
  */
-void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
-		  int trylock, int read, int check, unsigned long ip)
+notrace void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
+			  int trylock, int read, int check, unsigned long ip)
 {
 	unsigned long flags;
 
@@ -2723,7 +2723,8 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
 
 EXPORT_SYMBOL_GPL(lock_acquire);
 
-void lock_release(struct lockdep_map *lock, int nested, unsigned long ip)
+notrace void lock_release(struct lockdep_map *lock, int nested,
+			  unsigned long ip)
 {
 	unsigned long flags;
 
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index ae28c824512..a1fb54c93cd 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -436,7 +436,7 @@ int __lockfunc _spin_trylock_bh(spinlock_t *lock)
 }
 EXPORT_SYMBOL(_spin_trylock_bh);
 
-int in_lock_functions(unsigned long addr)
+notrace int in_lock_functions(unsigned long addr)
 {
 	/* Linker adds these: start and end of __lockfunc functions */
 	extern char __lock_text_start[], __lock_text_end[];
-- 
2.41.1