Re: [PATCH for-next 00/32] spin lock usage optimization for SCSI drivers

[Finn Thain]

On Sun, 7 Feb 2021, Xiaofei Tan wrote:

> Replace spin_lock_irqsave with spin_lock in hard IRQ of SCSI drivers. 
> There are no function changes, but may speed up if interrupt happen too 
> often.

This change doesn't necessarily work on platforms that support nested 
interrupts.

Were you able to measure any benefit from this change on some other 
platform?

Please see also,
https://lore.kernel.org/linux-scsi/89c5cb05cb844939ae684db0077f675f@xxxxxxx/