linux-kernel - [RFC Patch V1 17/30] mm, intel_powerclamp: Use cpu_to_mem()/numa_mem

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Date:	Fri, 11 Jul 2014 15:37:34 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: [RFC Patch V1 17/30] mm, intel_powerclamp: Use cpu_to_mem()/numa_mem_id() to support memoryless node

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@...ux.intel.com>
---
 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,
 	case CPU_ONLINE:
 		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);
-- 
1.7.10.4

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