linux-kernel - [RFC PATCH v2 19/25] dnuma: memlayout: add memory_add_physaddr_to_nid() for memory

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Date:	Thu, 11 Apr 2013 18:13:51 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Simon Jeons <simon.jeons@...il.com>
Subject: [RFC PATCH v2 19/25] dnuma: memlayout: add memory_add_physaddr_to_nid() for memory_hotplug

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 mm/memlayout.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/mm/memlayout.c b/mm/memlayout.c
index 45e7df6..4dc6706 100644
--- a/mm/memlayout.c
+++ b/mm/memlayout.c
@@ -247,3 +247,19 @@ void memlayout_global_init(void)
 
 	memlayout_commit(ml);
 }
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+/*
+ * Provides a default memory_add_physaddr_to_nid() for memory hotplug, unless
+ * overridden by the arch.
+ */
+__weak
+int memory_add_physaddr_to_nid(u64 start)
+{
+	int nid = memlayout_pfn_to_nid(PFN_DOWN(start));
+	if (nid == NUMA_NO_NODE)
+		return 0;
+	return nid;
+}
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif
-- 
1.8.2.1

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