linux-kernel - [PATCH] eHCA: Make scaling code also work without CPU hotplug

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Message-Id: <200703221652.13216.fenkes@de.ibm.com>
Date:	Thu, 22 Mar 2007 16:52:13 +0100
From:	Joachim Fenkes <fenkes@...ibm.com>
To:	rolandd@...co.com, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, general@...ts.openfabrics.org
Cc:	hnguyen@...ibm.com
Subject: [PATCH] eHCA: Make scaling code also work without CPU hotplug

eHCA scaling code must not depend on register_cpu_notifier() if
CONFIG_HOTPLUG_CPU is not set, so put all related code into #ifdefs.


Signed-off-by: Joachim Fenkes <fenkes@...ibm.com>
---


 ehca_irq.c |    8 ++++++++
 1 file changed, 8 insertions(+)


diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infiniband/hw/ehca/ehca_irq.c
index 20f36bf..f284be1 100644
--- a/drivers/infiniband/hw/ehca/ehca_irq.c
+++ b/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -66,7 +66,9 @@ #define ERROR_DATA_TYPE        EHCA_BMAS
 static void queue_comp_task(struct ehca_cq *__cq);
 
 static struct ehca_comp_pool* pool;
+#ifdef CONFIG_HOTPLUG_CPU
 static struct notifier_block comp_pool_callback_nb;
+#endif
 
 static inline void comp_event_callback(struct ehca_cq *cq)
 {
@@ -733,6 +735,7 @@ static void take_over_work(struct ehca_c
 
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
 static int comp_pool_callback(struct notifier_block *nfb,
 			      unsigned long action,
 			      void *hcpu)
@@ -775,6 +778,7 @@ static int comp_pool_callback(struct not
 
 	return NOTIFY_OK;
 }
+#endif
 
 int ehca_create_comp_pool(void)
 {
@@ -805,9 +809,11 @@ int ehca_create_comp_pool(void)
 		}
 	}
 
+#ifdef CONFIG_HOTPLUG_CPU
 	comp_pool_callback_nb.notifier_call = comp_pool_callback;
 	comp_pool_callback_nb.priority =0;
 	register_cpu_notifier(&comp_pool_callback_nb);
+#endif
 
 	printk(KERN_INFO "eHCA scaling code enabled\n");
 
@@ -821,7 +827,9 @@ void ehca_destroy_comp_pool(void)
 	if (!ehca_scaling_code)
 		return;
 
+#ifdef CONFIG_HOTPLUG_CPU
 	unregister_cpu_notifier(&comp_pool_callback_nb);
+#endif
 
 	for (i = 0; i < NR_CPUS; i++) {
 		if (cpu_online(i))

-
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