linux-kernel - [RFC Patch V1 10/30] mm, xfrm: Use cpu_to_mem()/numa_mem

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Date:	Fri, 11 Jul 2014 15:37:27 +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>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
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,
	netdev@...r.kernel.org
Subject: [RFC Patch V1 10/30] mm, xfrm: 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>
---
 net/xfrm/xfrm_ipcomp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
index ccfdc7115a83..129f469ae75d 100644
--- a/net/xfrm/xfrm_ipcomp.c
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -235,7 +235,7 @@ static void * __percpu *ipcomp_alloc_scratches(void)
 	for_each_possible_cpu(i) {
 		void *scratch;
 
-		scratch = vmalloc_node(IPCOMP_SCRATCH_SIZE, cpu_to_node(i));
+		scratch = vmalloc_node(IPCOMP_SCRATCH_SIZE, cpu_to_mem(i));
 		if (!scratch)
 			return NULL;
 		*per_cpu_ptr(scratches, i) = scratch;
-- 
1.7.10.4

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