linux-kernel - [PATCH] Expose the irq

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Message-ID: <20091211162532.GA2716@sgi.com>
Date:	Fri, 11 Dec 2009 10:25:32 -0600
From:	Dimitri Sivanich <sivanich@....com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Arjan van de Ven <arjan@...radead.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Miller <davem@...emloft.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: [PATCH] Expose the irq_desc node in proc/irq

Expose the irq_desc node as /proc/irq/*/node.

Signed-off-by: Dimitri Sivanich <sivanich@....com>

---

 kernel/irq/proc.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

Index: linux/kernel/irq/proc.c
===================================================================
--- linux.orig/kernel/irq/proc.c	2009-12-11 10:09:31.000000000 -0600
+++ linux/kernel/irq/proc.c	2009-12-11 10:15:28.000000000 -0600
@@ -146,6 +146,26 @@ static const struct file_operations defa
 	.release	= single_release,
 	.write		= default_affinity_write,
 };
+
+static int irq_node_proc_show(struct seq_file *m, void *v)
+{
+	struct irq_desc *desc = irq_to_desc((long) m->private);
+
+	seq_printf(m, "%d\n", desc->node);
+	return 0;
+}
+
+static int irq_node_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, irq_node_proc_show,  PDE(inode)->data);
+}
+
+static const struct file_operations irq_node_proc_fops = {
+	.open		= irq_node_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
 #endif
 
 static int irq_spurious_proc_show(struct seq_file *m, void *v)
@@ -230,6 +250,9 @@ void register_irq_proc(unsigned int irq,
 	/* create /proc/irq/<irq>/smp_affinity */
 	proc_create_data("smp_affinity", 0600, desc->dir,
 			 &irq_affinity_proc_fops, (void *)(long)irq);
+
+	proc_create_data("node", 0444, desc->dir,
+			 &irq_node_proc_fops, (void *)(long)irq);
 #endif
 
 	proc_create_data("spurious", 0444, desc->dir,
--
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