[PATCH 1/2] nvme-pci; remove the barriers nvme_irq()

[Chaitanya Kulkarni]

(+Heiner)

On 2/19/21 05:40, Jens Axboe wrote:
> On 2/18/21 11:37 PM, Chaitanya Kulkarni wrote:
>> The barriers were added to the nvme_irq() in the
>> commit 3a7afd8ee42a ("nvme-pci: remove the CQ lock for interrupt driven queues")
>> to prevent compiler from doing memory optimization for the variabes that
>> were protected previously by spinlock in nvme_irq() at completion queue
>> processing and with queue head check condition..
>>
>> The variable nvmeq->last_cq_head from those checks was removed in the
>> commit f6c4d97b0d82 ("nvme/pci: Remove last_cq_head")") that was
>> preventing  poll queues from mistakenly triggering the spurious
>> interrupt detection.
>>
>> Remove the barriers which were protecting the updates to the variables.
> Would seem prudent to just ask the original submitter to send a v2
> of his patch, as that's where it came from.
>
Please let me know if you want to send V2 otherwise please ack this series.