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From: Yinghai Lu on 13 May 2010 20:30
It can be used to find NODE_DATA for numa.

Need to make sure early_node_map[] is filled before it is called, otherwise
it will fallback to lmb_find_area(), with node range.

Signed-off-by: Yinghai Lu <yinghai(a)kernel.org>
---
arch/x86/include/asm/lmb.h | 1 +
arch/x86/mm/lmb.c | 15 +++++++++++++++
2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/lmb.h b/arch/x86/include/asm/lmb.h
index d0ae19f..358d8a6 100644
--- a/arch/x86/include/asm/lmb.h
+++ b/arch/x86/include/asm/lmb.h
@@ -15,5 +15,6 @@ int get_free_all_memory_range(struct range **rangep, int nodeid);
void lmb_register_active_regions(int nid, unsigned long start_pfn,
unsigned long last_pfn);
u64 lmb_hole_size(u64 start, u64 end);
+u64 lmb_find_area_node(int nid, u64 start, u64 end, u64 size, u64 align);

#endif
diff --git a/arch/x86/mm/lmb.c b/arch/x86/mm/lmb.c
index faa9ce6..c5fa1dd 100644
--- a/arch/x86/mm/lmb.c
+++ b/arch/x86/mm/lmb.c
@@ -254,6 +254,21 @@ void __init lmb_free_area(u64 start, u64 end)
}

/*
+ * Need to call this function after lmb_register_active_regions,
+ * so early_node_map[] is filled already.
+ */
+u64 __init lmb_find_area_node(int nid, u64 start, u64 end, u64 size, u64 align)
+{
+ u64 addr;
+ addr = find_memory_core_early(nid, size, align, start, end);
+ if (addr != LMB_ERROR)
+ return addr;
+
+ /* Fallback, should already have start end within node range */
+ return lmb_find_area(start, end, size, align);
+}
+
+/*
* Finds an active region in the address range from start_pfn to last_pfn and
* returns its range in ei_startpfn and ei_endpfn for the lmb entry.
*/
--
1.6.4.2

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