The following commit has been merged into the irq/urgent branch of tip: Commit-ID: edbbaae42a56f9a2b39c52ef2504dfb3fb0a7858 Gitweb: https://git.kernel.org/tip/edbbaae42a56f9a2b39c52ef2504dfb3fb0a7858 Author: Shay Drory <shayd@xxxxxxxxxx> AuthorDate: Tue, 06 Aug 2024 10:20:44 +03:00 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitterDate: Wed, 07 Aug 2024 17:27:00 +02:00 genirq/irqdesc: Honor caller provided affinity in alloc_desc() Currently, whenever a caller is providing an affinity hint for an interrupt, the allocation code uses it to calculate the node and copies the cpumask into irq_desc::affinity. If the affinity for the interrupt is not marked 'managed' then the startup of the interrupt ignores irq_desc::affinity and uses the system default affinity mask. Prevent this by setting the IRQD_AFFINITY_SET flag for the interrupt in the allocator, which causes irq_setup_affinity() to use irq_desc::affinity on interrupt startup if the mask contains an online CPU. [ tglx: Massaged changelog ] Fixes: 45ddcecbfa94 ("genirq: Use affinity hint in irqdesc allocation") Signed-off-by: Shay Drory <shayd@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/all/20240806072044.837827-1-shayd@xxxxxxxxxx --- kernel/irq/irqdesc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 07e99c9..1dee88b 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -530,6 +530,7 @@ static int alloc_descs(unsigned int start, unsigned int cnt, int node, flags = IRQD_AFFINITY_MANAGED | IRQD_MANAGED_SHUTDOWN; } + flags |= IRQD_AFFINITY_SET; mask = &affinity->mask; node = cpu_to_node(cpumask_first(mask)); affinity++;
