linux-kernel - [RFC Patch V1 12/30] mm, IB/qib: Use cpu_to_mem()/numa_mem

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Date:	Fri, 11 Jul 2014 15:37:29 +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>,
	Mike Marciniszyn <infinipath@...el.com>,
	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...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-rdma@...r.kernel.org
Subject: [RFC Patch V1 12/30] mm, IB/qib: 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/infiniband/hw/qib/qib_file_ops.c |    4 ++--
 drivers/infiniband/hw/qib/qib_init.c     |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/qib/qib_file_ops.c b/drivers/infiniband/hw/qib/qib_file_ops.c
index b15e34eeef68..55540295e0e3 100644
--- a/drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/drivers/infiniband/hw/qib/qib_file_ops.c
@@ -1312,8 +1312,8 @@ static int setup_ctxt(struct qib_pportdata *ppd, int ctxt,
 	assign_ctxt_affinity(fp, dd);
 
 	numa_id = qib_numa_aware ? ((fd->rec_cpu_num != -1) ?
-		cpu_to_node(fd->rec_cpu_num) :
-		numa_node_id()) : dd->assigned_node_id;
+		cpu_to_mem(fd->rec_cpu_num) : numa_mem_id()) :
+		dd->assigned_node_id;
 
 	rcd = qib_create_ctxtdata(ppd, ctxt, numa_id);
 
diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
index 8d3c78ddc906..85ff56ad1075 100644
--- a/drivers/infiniband/hw/qib/qib_init.c
+++ b/drivers/infiniband/hw/qib/qib_init.c
@@ -133,7 +133,7 @@ int qib_create_ctxts(struct qib_devdata *dd)
 	int local_node_id = pcibus_to_node(dd->pcidev->bus);
 
 	if (local_node_id < 0)
-		local_node_id = numa_node_id();
+		local_node_id = numa_mem_id();
 	dd->assigned_node_id = local_node_id;
 
 	/*
-- 
1.7.10.4

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