linux-kernel - [RFC v2 PATCH 03/14] irq: add new struct ipi

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Date:	Tue, 13 Oct 2015 11:16:11 +0100
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>,
	Qais Yousef <qais.yousef@...tec.com>
Subject: [RFC v2 PATCH 03/14] irq: add new struct ipi_mask

cpumask is limited to NR_CPUS. introduce ipi_mask which allows us to address
cpu range that is higher than NR_CPUS which is required for drivers to send
IPIs for coprocessor that are outside Linux CPU range.

Signed-off-by: Qais Yousef <qais.yousef@...tec.com>
---
 include/linux/irq.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 11bf09288ddb..4b537e4d393b 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -125,6 +125,21 @@ enum {
 struct msi_desc;
 struct irq_domain;
 
+ /**
+ * struct ipi_mask - IPI mask information
+ * @cpumask: bitmap of cpumasks
+ * @nbits: number of bits in cpumask
+ * @global: whether the mask is SMP IPI ie: subset of cpu_possible_mask or not
+ *
+ * ipi_mask is similar to cpumask, but it provides nbits that's configurable
+ * rather than fixed to NR_CPUS.
+ */
+struct ipi_mask {
+	unsigned long	*cpumask;
+	unsigned int	nbits;
+	bool		global;
+};
+
 /**
  * struct irq_common_data - per irq data shared by all irqchips
  * @state_use_accessors: status information for irq chip functions.
-- 
2.1.0

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