[PATCH v4 06/19] genirq: Add an extra comment about the use of affinity in irq_common_data

From: Qais Yousef
Date: Tue Dec 08 2015 - 08:21:18 EST

Affinity will have dual meaning depends on the type of the irq. If it is
a normal irq, it'll have the standard affinity meaning.

If it is an IPI, it will hold the IPI mask of the cpus it can talk to.

Signed-off-by: Qais Yousef <qais.yousef@xxxxxxxxxx>
include/linux/irq.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 6bcbd11207ea..7f6dd4eec207 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -145,7 +145,9 @@ struct ipi_mapping {
* Use accessor functions to deal with it
* @node: node index useful for balancing
* @handler_data: per-IRQ data for the irq_chip methods
- * @affinity: IRQ affinity on SMP
+ * @affinity: IRQ affinity on SMP.
+ * If this is an IPI irq data, this will be the IPI mask
+ * of the cpus it can talk to.
* @msi_desc: MSI descriptor
* @ipi_mapping: Contains the hwirq mapping of IPIs.
* The use of this struct is optional and not all irqchips

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