linux-kernel - [RFC Patch V1 18/30] mm, bnx2fc: Use cpu_to_mem()/numa_mem

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Date:	Fri, 11 Jul 2014 15:37:35 +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>,
	Eddie Wai <eddie.wai@...adcom.com>,
	"James E.J. Bottomley" <JBottomley@...allels.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-scsi@...r.kernel.org
Subject: [RFC Patch V1 18/30] mm, bnx2fc: 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/scsi/bnx2fc/bnx2fc_fcoe.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
index 785d0d71781e..144534a51cbb 100644
--- a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
@@ -2453,7 +2453,7 @@ static void bnx2fc_percpu_thread_create(unsigned int cpu)
 	p = &per_cpu(bnx2fc_percpu, cpu);
 
 	thread = kthread_create_on_node(bnx2fc_percpu_io_thread,
-					(void *)p, cpu_to_node(cpu),
+					(void *)p, cpu_to_mem(cpu),
 					"bnx2fc_thread/%d", cpu);
 	/* bind thread to the cpu */
 	if (likely(!IS_ERR(thread))) {
-- 
1.7.10.4

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