[RFC Patch V1 01/30] mm, kernel: Use cpu_to_mem()/numa_mem_id() to support memoryless node

[Jiang Liu]

When CONFIG_HAVE_MEMORYLESS_NODES is enabled, cpu_to_node()/numa_node_id()
may return a node without memory, and later cause system failure/panic
when calling kmalloc_node() and friends with returned node id.
So use cpu_to_mem()/numa_mem_id() instead to get the nearest node with
memory for the/current cpu.

If CONFIG_HAVE_MEMORYLESS_NODES is disabled, cpu_to_mem()/numa_mem_id()
is the same as cpu_to_node()/numa_node_id().

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
 kernel/rcu/rcutorture.c |    2 +-
 kernel/smp.c            |    2 +-
 kernel/smpboot.c        |    2 +-
 kernel/taskstats.c      |    2 +-
 kernel/timer.c          |    2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 7fa34f86e5ba..f593762d3214 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1209,7 +1209,7 @@ static int rcutorture_booster_init(int cpu)
 	mutex_lock(&boost_mutex);
 	VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task");
 	boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL,
-						  cpu_to_node(cpu),
+						  cpu_to_mem(cpu),
 						  "rcu_torture_boost");
 	if (IS_ERR(boost_tasks[cpu])) {
 		retval = PTR_ERR(boost_tasks[cpu]);
diff --git a/kernel/smp.c b/kernel/smp.c
index 80c33f8de14f..2f3b84aef159 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -41,7 +41,7 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
 		if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
-				cpu_to_node(cpu)))
+				cpu_to_mem(cpu)))
 			return notifier_from_errno(-ENOMEM);
 		cfd->csd = alloc_percpu(struct call_single_data);
 		if (!cfd->csd) {
diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index eb89e1807408..9c08e68e48a9 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -171,7 +171,7 @@ __smpboot_create_thread(struct smp_hotplug_thread *ht, unsigned int cpu)
 	if (tsk)
 		return 0;
 
-	td = kzalloc_node(sizeof(*td), GFP_KERNEL, cpu_to_node(cpu));
+	td = kzalloc_node(sizeof(*td), GFP_KERNEL, cpu_to_mem(cpu));
 	if (!td)
 		return -ENOMEM;
 	td->cpu = cpu;
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 13d2f7cd65db..cf5cba1e7fbe 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -304,7 +304,7 @@ static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd)
 	if (isadd == REGISTER) {
 		for_each_cpu(cpu, mask) {
 			s = kmalloc_node(sizeof(struct listener),
-					GFP_KERNEL, cpu_to_node(cpu));
+					GFP_KERNEL, cpu_to_mem(cpu));
 			if (!s) {
 				ret = -ENOMEM;
 				goto cleanup;
diff --git a/kernel/timer.c b/kernel/timer.c
index 3bb01a323b2a..5831a38b5681 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1546,7 +1546,7 @@ static int init_timers_cpu(int cpu)
 			 * The APs use this path later in boot
 			 */
 			base = kzalloc_node(sizeof(*base), GFP_KERNEL,
-					    cpu_to_node(cpu));
+					    cpu_to_mem(cpu));
 			if (!base)
 				return -ENOMEM;
 
-- 
1.7.10.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/