> Hello Kirill, Hello Pavel,
>
> 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.
Maybe, but BCs are the only user of this so far...
Thanks,
Kirill
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