On Fri, Sep 28, 2007 at 02:14:11PM +0200, Peter Zijlstra wrote:
> On Fri, 2007-09-28 at 14:03 +0200, Heiko Carstens wrote:
> > > +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 at syscall exit time! ]\n");
> > > + printk( "----------------------------------------\n");
> > > + printk("%s/%d is leaving the kernel with locks still held!\n",
> > > + curr->comm, curr->pid);
> > > + lockdep_print_held_locks(curr);
> > > + }
> > > +}
> >
> > By the way, the s390 patch I just posted also checks if we hold any locks
> > when returning from interrupt context to user space. Maybe the above text
> > could be changed to "lock held when returning to user space" ?
>
> Good idea, I'll look at doing the same for i386/x86_64. Traps (page
> faults) would also make sense I guess.
Yes, traps and syscalls have the same exit path on s390. So we do that
alreasy as well.
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