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INTMS/INTMC not being used in NVME interrupt handling


As per NVME specification: Host Software Interrupt Handling
It is recommended that host software utilize the Interrupt Mask Set and Interrupt Mask Clear (INTMS/INTMC) 
registers to efficiently handle interrupts when configured to use pin based or MSI messages.

In kernel 4.14, drivers/nvme/host/pci.c function nvme_isr 
doesn't  use these registers. 

Any reason why these registers are not used in nvme interrupt handler ?

Why NVMe driver is not using any bottom half and processing all completion queues
in interrupt handler ?