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@nvidia.com AuthorDate: Tue, 06 Aug 2024 10:20:44 +03:00 Committer: Thomas Gleixner tglx@linutronix.de 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@nvidia.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20240806072044.837827-1-shayd@nvidia.com
--- 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++;