linux-kernel - [PATCH 2/2] kvm: use cpumask_var_t for cpus_hardware

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Date:	Sun, 7 Dec 2008 21:25:45 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"kvm-devel" <kvm-devel@...ts.sourceforge.net>
Cc:	linux-kernel@...r.kernel.org, Mike Travis <travis@....com>,
	Avi Kivity <avi@...ranet.com>
Subject: [PATCH 2/2] kvm: use cpumask_var_t for cpus_hardware_enabled

This changes cpus_hardware_enabled from a cpumask_t to a cpumask_var_t:
equivalent for CONFIG_CPUMASKS_OFFSTACK=n, otherwise dynamically allocated.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 virt/kvm/kvm_main.c |   20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -63,7 +63,7 @@ DEFINE_SPINLOCK(kvm_lock);
 DEFINE_SPINLOCK(kvm_lock);
 LIST_HEAD(vm_list);
 
-static cpumask_t cpus_hardware_enabled;
+static cpumask_var_t cpus_hardware_enabled;
 
 struct kmem_cache *kvm_vcpu_cache;
 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
@@ -1796,9 +1796,9 @@ static void hardware_enable(void *junk)
 {
 	int cpu = raw_smp_processor_id();
 
-	if (cpu_isset(cpu, cpus_hardware_enabled))
+	if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
 		return;
-	cpu_set(cpu, cpus_hardware_enabled);
+	cpumask_set_cpu(cpu, cpus_hardware_enabled);
 	kvm_arch_hardware_enable(NULL);
 }
 
@@ -1806,9 +1806,9 @@ static void hardware_disable(void *junk)
 {
 	int cpu = raw_smp_processor_id();
 
-	if (!cpu_isset(cpu, cpus_hardware_enabled))
+	if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
 		return;
-	cpu_clear(cpu, cpus_hardware_enabled);
+	cpumask_clear_cpu(cpu, cpus_hardware_enabled);
 	kvm_arch_hardware_disable(NULL);
 }
 
@@ -2042,9 +2042,14 @@ int kvm_init(void *opaque, unsigned int 
 
 	bad_pfn = page_to_pfn(bad_page);
 
+	if (!alloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
+		r = -ENOMEM;
+		goto out_free_0;
+	}
+
 	r = kvm_arch_hardware_setup();
 	if (r < 0)
-		goto out_free_0;
+		goto out_free_0a;
 
 	for_each_online_cpu(cpu) {
 		smp_call_function_single(cpu,
@@ -2103,6 +2108,8 @@ out_free_2:
 	on_each_cpu(hardware_disable, NULL, 1);
 out_free_1:
 	kvm_arch_hardware_unsetup();
+out_free_0a:
+	free_cpumask_var(cpus_hardware_enabled);
 out_free_0:
 	__free_page(bad_page);
 out:
@@ -2126,6 +2133,7 @@ void kvm_exit(void)
 	kvm_arch_hardware_unsetup();
 	kvm_arch_exit();
 	kvm_exit_debug();
+	free_cpumask_var(cpus_hardware_enabled);
 	__free_page(bad_page);
 }
 EXPORT_SYMBOL_GPL(kvm_exit);

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