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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>
This commit is contained in:
Steven Rostedt 2008-05-12 21:20:44 +02:00 committed by Thomas Gleixner
parent 361943ad0b
commit 0764d23cf0
2 changed files with 13 additions and 12 deletions
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19
kernel/lockdep.c
View File

@ -271,14 +271,14 @@ static struct list_head chainhash_table[CHAINHASH_SIZE];
((key1) >> (64-MAX_LOCKDEP_KEYS_BITS)) ^ \ ((key1) >> (64-MAX_LOCKDEP_KEYS_BITS)) ^ \
(key2)) (key2))
void lockdep_off(void) notrace void lockdep_off(void)
{ {
current->lockdep_recursion++; current->lockdep_recursion++;
} }
EXPORT_SYMBOL(lockdep_off); EXPORT_SYMBOL(lockdep_off);
void lockdep_on(void) notrace void lockdep_on(void)
{ {
current->lockdep_recursion--; 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 1 otherwise and keep <backwards_match> unchanged.
* Return 0 on error. * Return 0 on error.
*/ */
static noinline int static noinline notrace int
find_usage_backwards(struct lock_class *source, unsigned int depth) find_usage_backwards(struct lock_class *source, unsigned int depth)
{ {
struct lock_list *entry; 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 * We are building curr_chain_key incrementally, so double-check
* it from scratch, to make sure that it's done correctly: * 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 #ifdef CONFIG_DEBUG_LOCKDEP
struct held_lock *hlock, *prev_hlock = NULL; 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: * Mark all held locks with a usage bit:
*/ */
static int static notrace int
mark_held_locks(struct task_struct *curr, int hardirq) mark_held_locks(struct task_struct *curr, int hardirq)
{ {
enum lock_usage_bit usage_bit; enum lock_usage_bit usage_bit;
@ -2260,7 +2260,7 @@ static inline int separate_irq_context(struct task_struct *curr,
/* /*
* Mark a lock with a usage bit, and validate the state transition: * Mark a lock with a usage bit, and validate the state transition:
*/ */
static int mark_lock(struct task_struct *curr, struct held_lock *this, static notrace int mark_lock(struct task_struct *curr, struct held_lock *this,
enum lock_usage_bit new_bit) enum lock_usage_bit new_bit)
{ {
unsigned int new_mask = 1 << new_bit, ret = 1; 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: * 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 defined(CONFIG_DEBUG_LOCKDEP) && defined(CONFIG_TRACE_IRQFLAGS)
if (!debug_locks) if (!debug_locks)
@ -2700,7 +2700,7 @@ static void check_flags(unsigned long flags)
* We are not always called with irqs disabled - do that here, * We are not always called with irqs disabled - do that here,
* and also avoid lockdep recursion: * and also avoid lockdep recursion:
*/ */
void lock_acquire(struct lockdep_map *lock, unsigned int subclass, notrace void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
int trylock, int read, int check, unsigned long ip) int trylock, int read, int check, unsigned long ip)
{ {
unsigned long flags; unsigned long flags;
@ -2723,7 +2723,8 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
EXPORT_SYMBOL_GPL(lock_acquire); 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; unsigned long flags;

2
kernel/spinlock.c
View File

@ -436,7 +436,7 @@ int __lockfunc _spin_trylock_bh(spinlock_t *lock)
} }
EXPORT_SYMBOL(_spin_trylock_bh); 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 */ /* Linker adds these: start and end of __lockfunc functions */
extern char __lock_text_start[], __lock_text_end[]; extern char __lock_text_start[], __lock_text_end[];