From 82dc62254ef40fa7a2163f61a7db0c8ab5b3e418 Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon@arm.com>
Date: Fri, 18 Feb 2011 16:21:06 +0100
Subject: [PATCH] --- yaml --- r: 233481 b: refs/heads/master c:
 71efb063f4a145ae420be054f5a91dcf7c19b375 h: refs/heads/master i:   233479:
 0c6122b53683a8629308672ede9ddf4edbc91f67 v: v3

---
 [refs]                      |  2 +-
 trunk/arch/arm/kernel/pmu.c | 22 ++++++++++++++--------
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/[refs] b/[refs]
index 1e3038298cc6..f9be34f4d6d6 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 885028e4ba4caf49d565c96481e1a05220ecb517
+refs/heads/master: 71efb063f4a145ae420be054f5a91dcf7c19b375
diff --git a/trunk/arch/arm/kernel/pmu.c b/trunk/arch/arm/kernel/pmu.c
index b8af96ea62e6..2c79eec19262 100644
--- a/trunk/arch/arm/kernel/pmu.c
+++ b/trunk/arch/arm/kernel/pmu.c
@@ -97,28 +97,34 @@ set_irq_affinity(int irq,
 			   irq, cpu);
 	return err;
 #else
-	return 0;
+	return -EINVAL;
 #endif
 }
 
 static int
 init_cpu_pmu(void)
 {
-	int i, err = 0;
+	int i, irqs, err = 0;
 	struct platform_device *pdev = pmu_devices[ARM_PMU_DEVICE_CPU];
 
-	if (!pdev) {
-		err = -ENODEV;
-		goto out;
-	}
+	if (!pdev)
+		return -ENODEV;
+
+	irqs = pdev->num_resources;
+
+	/*
+	 * If we have a single PMU interrupt that we can't shift, assume that
+	 * we're running on a uniprocessor machine and continue.
+	 */
+	if (irqs == 1 && !irq_can_set_affinity(platform_get_irq(pdev, 0)))
+		return 0;
 
-	for (i = 0; i < pdev->num_resources; ++i) {
+	for (i = 0; i < irqs; ++i) {
 		err = set_irq_affinity(platform_get_irq(pdev, i), i);
 		if (err)
 			break;
 	}
 
-out:
 	return err;
 }