adulau/aha
1
0
Fork 0
mirror of https://github.com/adulau/aha.git synced 2024-12-28 03:36:19 +00:00
Code Issues Projects Releases Packages Wiki Activity

lockdep: syscall exit check

Browse source 
Provide a check to validate that we do not hold any locks when switching
back to user-space.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2007-10-11 22:11:12 +02:00
parent e4564f79d4
commit b351d164e8
2 changed files with 18 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/lockdep.h
View file

@ -238,6 +238,7 @@ extern void lockdep_info(void);
extern void lockdep_reset(void); extern void lockdep_reset(void);
extern void lockdep_reset_lock(struct lockdep_map *lock); extern void lockdep_reset_lock(struct lockdep_map *lock);
extern void lockdep_free_key_range(void *start, unsigned long size); extern void lockdep_free_key_range(void *start, unsigned long size);
extern void lockdep_sys_exit(void);
extern void lockdep_off(void); extern void lockdep_off(void);
extern void lockdep_on(void); extern void lockdep_on(void);
@ -317,6 +318,7 @@ static inline void lockdep_on(void)
# define INIT_LOCKDEP # define INIT_LOCKDEP
# define lockdep_reset() do { debug_locks = 1; } while (0) # define lockdep_reset() do { debug_locks = 1; } while (0)
# define lockdep_free_key_range(start, size) do { } while (0) # define lockdep_free_key_range(start, size) do { } while (0)
# define lockdep_sys_exit() do { } while (0)
/* /*
* The class key takes no space if lockdep is disabled: * The class key takes no space if lockdep is disabled:
*/ */

16
kernel/lockdep.c
View file

@ -3199,3 +3199,19 @@ void debug_show_held_locks(struct task_struct *task)
} }
EXPORT_SYMBOL_GPL(debug_show_held_locks); EXPORT_SYMBOL_GPL(debug_show_held_locks);
void lockdep_sys_exit(void)
{
struct task_struct *curr = current;
if (unlikely(curr->lockdep_depth)) {
if (!debug_locks_off())
return;
printk("\n================================================\n");
printk( "[ BUG: lock held when returning to user space! ]\n");
printk( "------------------------------------------------\n");
printk("%s/%d is leaving the kernel with locks still held!\n",
curr->comm, curr->pid);
lockdep_print_held_locks(curr);
}
}