Re: [PATCH 3/3] x86/irq, iommu/amd, PCI: Drop redundant irq_retrigger inits

With fixup_irqs() now using irq_chip_retrigger_hierarchy() and the generic
resend path (try_retrigger()) already falling back to it, installing
irq_chip_retrigger_hierarchy() as the irq_retrigger() callback on the
outermost domain chips is no longer required. The hierarchy walk reaches
the x86 vector domain's apic_retrigger_irq() for all of these stacked
domain chips.

Remove the now redundant irq_retrigger() initializations from the outermost
domain interrupt chips.
msi_set_affinity() is the only site that invoked the outermost chip's
irq_retrigger() directly. Convert it to irq_chip_retrigger_hierarchy() so
the x86_init_dev_msi_info() initialization can be dropped as well.

No functional change intended.

Suggested-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Naman Jain <redacted>

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

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260728135117.2888175-1-namjain@linux.microsoft.com?part=3