Re: [patch] Real-Time Preemption, -RT-2.6.13-rc4-V0.7.52-01

Ingo Molnar
2005-07-31T10:43:33Z

* Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

> because end_buffer_async_read/write use bit_spin_(un)lock and I do not
> know how those interact with -RT.

bit_spin_lock is preemptible too - but it's not a too nice construct.
What seems to have happened in your trace is that local_irq_disable()
was used too in combination with bit-spinlocks, and a spinlock was taken
from within it. The best fix would be to get rid of bit-spinlocks ...

Ingo