From: Marc Zyngier Date: Fri, 5 Dec 2025 09:18:14 +0000 (+0000) Subject: genirq: Allow NULL affinity for setup_percpu_irq() X-Git-Tag: v6.19-rc1~6^2~2 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89acaa5537a29c742d7a6ed7241fc4cf5e2ef818;p=thirdparty%2Flinux.git 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 Signed-off-by: Marc Zyngier Signed-off-by: Thomas Gleixner Link: https://patch.msgid.link/20251205091814.3944205-1-maz@kernel.org Closes: https://lore.kernel.org/r/aTFozefMQRg7lYxh@aspen.lan --- diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 0bb29316b4362..8b1b4c8a4f54c 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -2470,6 +2470,9 @@ int setup_percpu_irq(unsigned int irq, struct irqaction *act) if (retval < 0) return retval; + if (!act->affinity) + act->affinity = cpu_online_mask; + retval = __setup_irq(irq, desc, act); if (retval)