From b351d164e860d1ffffdc501c32f55dd1446c385b Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 11 Oct 2007 22:11:12 +0200 Subject: lockdep: syscall exit check Provide a check to validate that we do not hold any locks when switching back to user-space. Signed-off-by: Peter Zijlstra Signed-off-by: Ingo Molnar --- kernel/lockdep.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'kernel/lockdep.c') diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 42ae4a5ab4dc..a6f1ee9c92d9 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -3199,3 +3199,19 @@ void debug_show_held_locks(struct task_struct *task) } 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); + } +} -- cgit v1.2.3