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Subject[PATCH: 003/017]Memory hotplug for new nodes v.4.(get node id at probe memory)
When CONFIG_NUMA && CONFIG_ARCH_MEMORY_PROBE, nid should be defined
before calling add_memory(nid, start, size).

Each arch , which supports CONFIG_NUMA && ARCH_MEMORY_PROBE, should
define arch_nid_probe(paddr);

Powerpc has nice function. X86_64 has not.....
Note:
If memory is hot-plugged by firmware, there is another *good* information
like pxm.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>

arch/powerpc/mm/mem.c | 5 +++++
drivers/base/memory.c | 3 ++-
include/linux/memory_hotplug.h | 9 +++++++++
3 files changed, 16 insertions(+), 1 deletion(-)
Index: pgdat8/arch/powerpc/mm/mem.c
===================================================================
--- pgdat8.orig/arch/powerpc/mm/mem.c 2006-03-17 13:48:31.665710185 +0900
+++ pgdat8/arch/powerpc/mm/mem.c 2006-03-17 13:52:47.538753925 +0900
@@ -114,6 +114,11 @@ void online_page(struct page *page)
num_physpages++;
}

+int arch_nid_probe(u64 start)
+{
+ return hot_add_scn_to_nid(start);
+}
+
int __meminit arch_add_memory(int nid, u64 start, u64 size)
{
struct pglist_data *pgdata;
Index: pgdat8/include/linux/memory_hotplug.h
===================================================================
--- pgdat8.orig/include/linux/memory_hotplug.h 2006-03-17 13:48:31.626647685 +0900
+++ pgdat8/include/linux/memory_hotplug.h 2006-03-17 13:51:28.325864271 +0900
@@ -66,6 +66,15 @@ extern int online_pages(unsigned long, u
/* reasonably generic interface to expand the physical pages in a zone */
extern int __add_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages);
+#if defined(CONFIG_NUMA) && defined(CONFIG_ARCH_MEMORY_PROBE)
+extern int arch_nid_probe(u64 start);
+#else
+static inline int arch_nid_probe(u64 start)
+{
+ return 0;
+}
+#endif
+
#else /* ! CONFIG_MEMORY_HOTPLUG */
/*
* Stub functions for when hotplug is off
Index: pgdat8/drivers/base/memory.c
===================================================================
--- pgdat8.orig/drivers/base/memory.c 2006-03-17 13:47:31.558289046 +0900
+++ pgdat8/drivers/base/memory.c 2006-03-17 13:51:28.326840833 +0900
@@ -310,7 +310,8 @@ memory_probe_store(struct class *class,

phys_addr = simple_strtoull(buf, NULL, 0);

- ret = add_memory(phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);
+ ret = add_memory(arch_nid_probe(phys_addr),
+ phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);

if (ret)
count = ret;
--
Yasunori Goto


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