linux-kernel - [PATCH v4 06/19] genirq: Add an extra comment about the use of affinity in irq_common

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Date:	Tue, 8 Dec 2015 13:20:17 +0000
From:	Qais Yousef <qais.yousef@...tec.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<tglx@...utronix.de>, <jason@...edaemon.net>,
	<marc.zyngier@....com>, <jiang.liu@...ux.intel.com>,
	<ralf@...ux-mips.org>, <linux-mips@...ux-mips.org>,
	<lisa.parratt@...tec.com>, Qais Yousef <qais.yousef@...tec.com>
Subject: [PATCH v4 06/19] genirq: Add an extra comment about the use of affinity in irq_common_data

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@...tec.com>
---
 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
-- 
2.1.0

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