Re: [PATCH v5 7/7] PCI/MSI: re-enable conditional parent mask/unmask with sw moderation

> Recent commits removed masking of interrupts at the PCIe level when
> the masking is also done at the parent (e.g. on ARM with GIC).  This
> optimization saves the PCIe write, and especially the expensive readback,
> but causes the device to still send MSI interrupts that are ignored.
> 
> As a result, it very harmful on platforms (many, for multiple
> architectures) that are unable to deal with too many MSI interrupts, and
> defeats GSIM (CONFIG_IRQ_SW_MODERATION), which is esplicitely designed to
> address this problem, but depends on masking interrupts at the PCIe level.
> 
> Revert to the old behavior when GSIM (CONFIG_IRQ_SW_MODERATION)
> is compiled in.
> 
> Signed-off-by: Luigi Rizzo <[email protected]>

Sashiko has reviewed this patch and found no issues. It looks great!

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