[PATCH V3] nvme-pci: allow unmanaged interrupts

[Christoph Hellwig]

On Tue, Jul 02, 2024 at 06:41:12PM +0800, Ming Lei wrote:
> From: Keith Busch <kbusch at kernel.org>
> 
> People _really_ want to control their interrupt affinity in some
> cases, such as Openshift with Performance profile, in which each
> irq's affinity is completely specified from userspace. Turns out
> that 'isolcpus=managed_irqs' isn't enough.
> 
> Add module parameter to allow unmanaged interrupts, just as some
> SCSI drivers are doing.

Same as before: hell no.  We can't just add hacky global kernel
parameters everywhere.  We need the cpu isolation infrastructure to
work properly instead of piling hacks of hacks in every relevant driver.