diff mbox series

[RFC,1/2] genirq: honor device NUMA node when allocating descs

Message ID 20200617093725.1725569-2-stefanha@redhat.com
State New
Headers show
Series genirq: take device NUMA node into account for managed IRQs | expand

Commit Message

Stefan Hajnoczi June 17, 2020, 9:37 a.m. UTC
Use the device's NUMA node instead of the first masked CPUs node when
descs are allocated. The mask may include all CPUs and therefore not
correspond to the home NUMA node of the device.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 kernel/irq/irqdesc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 1a7723604399..b9c4160d72c4 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -488,7 +488,8 @@  static int alloc_descs(unsigned int start, unsigned int cnt, int node,
 					IRQD_MANAGED_SHUTDOWN;
 			}
 			mask = &affinity->mask;
-			node = cpu_to_node(cpumask_first(mask));
+			if (node == NUMA_NO_NODE)
+				node = cpu_to_node(cpumask_first(mask));
 			affinity++;
 		}