tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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genirq: Allow NULL affinity for setup_percpu_irq()

setup_percpu_irq() was forgotten when the percpu_devid infrastructure was
updated to deal with CPU affinities.

In order to keep ignoring users of this legacy API, provide sensible
defaults by setting the affinity to cpu_online_mask if none was provided by
the caller.

Fixes: bdf4e2ac295fe ("genirq: Allow per-cpu interrupt sharing for non-overlapping affinities")
Reported-by: Daniel Thompson <danielt@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://patch.msgid.link/20251205091814.3944205-1-maz@kernel.org
Closes: https://lore.kernel.org/r/aTFozefMQRg7lYxh@aspen.lan

authored by

Marc Zyngier and committed by
Thomas Gleixner 89acaa55 cb015814

+3
+3
kernel/irq/manage.c
··· 2470 2470 if (retval < 0) 2471 2471 return retval; 2472 2472 2473 + if (!act->affinity) 2474 + act->affinity = cpu_online_mask; 2475 + 2473 2476 retval = __setup_irq(irq, desc, act); 2474 2477 2475 2478 if (retval)