Re: lockdep oddity

Heiko Carstens
2006-09-06T07:19:05Z

On Tue, Sep 05, 2006 at 01:07:47PM -0700, Daniel Walker wrote:
> On Tue, 2006-09-05 at 15:03 +0200, Heiko Carstens wrote:
> > Found this will debugging some random memory corruptions that happen when
> > CONFIG_PROVE_LOCKING and CONFIG_PROFILE_LIKELY are both on.
> > Switching both off or having only one of them on seems to work.
>
> There's potential for a some issues in current -mm , given the config
> above. If you us the generic atomic operations
> (asm-generic/bitops/atomic.h) for test_and_set_bit(). It eventually
> calls into trace_hardirqs_off() and then back into likely profiling.
>
> What architecture are you running this on?

This was s390. We have our own bitops and trace_hardirqs_off() won't
be called for test_and_set_bit(). Must be something different.