Sachin Sant [off-list ref] writes:

Linux-next (5.19.0-rc8-next-20220728) fails to build on powerpc with
following error:

ERROR: modpost: "memory_add_physaddr_to_nid" [drivers/cxl/cxl_pmem.ko] undefined!
make[1]: *** [scripts/Makefile.modpost:128: modules-only.symvers] Error 1

The code in question was last changed by following patch:

commit 04ad63f086d1
       cxl/region: Introduce cxl_pmem_region objects

This should fix it.

Dan, do you want to apply that on top of your tree to reduce the window
of breakage?

cheers


From 8ca5b098b6ff1048953be748dbffc987996e2605 Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Fri, 29 Jul 2022 16:13:55 +1000
Subject: [PATCH] powerpc/mm: Export memory_add_physaddr_to_nid() for modules

The cxl_pmem module wants to call memory_add_physaddr_to_nid(), so
export the symbol.

Fixes: 04ad63f086d1 ("cxl/region: Introduce cxl_pmem_region objects")
Reported-by: Sachin Sant <redacted>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/mm/mem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 7b0d286bf9ba..01772e79fd93 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c

@@ -55,6 +55,7 @@ int memory_add_physaddr_to_nid(u64 start)
 {
 	return hot_add_scn_to_nid(start);
 }
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 #endif
 
 int __weak create_section_mapping(unsigned long start, unsigned long end,

-- 
2.35.3