[PATCH] Revert "IB/core: Fix use workqueue without WQ_MEM_RECLAIM"

[Sagi Grimberg]

>>>> workqueue: WQ_MEM_RECLAIM nvme-wq:nvme_rdma_reconnect_ctrl_work
>>>> [nvme_rdma] is flushing !WQ_MEM_RECLAIM ib_addr:process_one_req [ib_core]
>>>
>>> And why does nvme-wq need WQ_MEM_RECLAIM flag? I wonder if it is really
>>> needed.
>>
>> Adding Sagi Grimberg to cc, he probably knows and can explain it better than me.
> 
> We already allocate so much memory on these paths it is pretty
> nonsense to claim they are a reclaim context. One allocation on the WQ
> is not going to be the problem.
> 
> Probably this nvme stuff should not be re-using a reclaim marke dWQ
> for memory allocating work like this, it is kind of nonsensical.

A controller reset runs on this workqueue, which should succeed to allow
for pages to be flushed to the nvme disk. So I'd say its kind of
essential that this sequence has a rescuer thread.