Kirill Korotaev wrote:
> Oleg Nesterov noticed to me that the construction like
> (used in beancounter patches and free_uid()):
>
> local_irq_save(flags);
> if (atomic_dec_and_lock(&refcnt, &lock))
> ...
>
> is not that good for preemtible kernels, since with preemption
> spin_lock() can schedule() to reduce latency. However, it won't schedule
> if interrupts are disabled.
>
> So this patch introduces atomic_dec_and_lock_irqsave() as a logical
> counterpart to atomic_dec_and_lock().
You should probably send that one independently from the BC
patchset.
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