[PATCH 6.6 136/301] memblock tests: fix undefined reference to `early_pfn_to_nid

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6.6-stable review patch.  If anyone has any objections, please let me know.


From: Wei Yang <richard.weiyang@xxxxxxxxx>

[ Upstream commit 7d8ed162e6a92268d4b2b84d364a931216102c8e ]

commit 6a9531c3a880 ("memblock: fix crash when reserved memory is not
added to memory") introduce the usage of early_pfn_to_nid, which is not
defined in memblock tests.

The original definition of early_pfn_to_nid is defined in mm.h, so let
add this in the corresponding mm.h.

Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
CC: Yajun Deng <yajun.deng@xxxxxxxxx>
CC: Mike Rapoport <rppt@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240402132701.29744-2-richard.weiyang@xxxxxxxxx
Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
 tools/include/linux/mm.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/include/linux/mm.h b/tools/include/linux/mm.h
index f3c82ab5b14cd..7d73da0980473 100644
--- a/tools/include/linux/mm.h
+++ b/tools/include/linux/mm.h
@@ -37,4 +37,9 @@ static inline void totalram_pages_add(long count)
+static inline int early_pfn_to_nid(unsigned long pfn)
+	return 0;

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