[RFC Patch V1 17/30] mm, intel_powerclamp: Use cpu_to_mem()/numa_mem_id() to support memoryless node

From: Jiang Liu
Date: Fri Jul 11 2014 - 03:45:50 EST

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>
drivers/thermal/intel_powerclamp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/intel_powerclamp.c b/drivers/thermal/intel_powerclamp.c
index 95cb7fc20e17..9d9be8cd1b50 100644
--- a/drivers/thermal/intel_powerclamp.c
+++ b/drivers/thermal/intel_powerclamp.c
@@ -531,7 +531,7 @@ static int start_power_clamp(void)

thread = kthread_create_on_node(clamp_thread,
(void *) cpu,
- cpu_to_node(cpu),
+ cpu_to_mem(cpu),
"kidle_inject/%ld", cpu);
/* bind to cpu here */
if (likely(!IS_ERR(thread))) {
@@ -582,7 +582,7 @@ static int powerclamp_cpu_callback(struct notifier_block *nfb,
thread = kthread_create_on_node(clamp_thread,
(void *) cpu,
- cpu_to_node(cpu),
+ cpu_to_mem(cpu),
"kidle_inject/%lu", cpu);
if (likely(!IS_ERR(thread))) {
kthread_bind(thread, cpu);

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