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Subject[PATCH] microblaze: fix min_low_pfn/max_low_pfn build errors
Date
Fix min_low_pfn/max_low_pfn build errors for arch/microblaze/: (e.g.)

ERROR: "min_low_pfn" [drivers/rpmsg/virtio_rpmsg_bus.ko] undefined!
ERROR: "min_low_pfn" [drivers/hwtracing/intel_th/intel_th_msu_sink.ko] undefined!
ERROR: "min_low_pfn" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined!
ERROR: "min_low_pfn" [drivers/mmc/core/mmc_core.ko] undefined!
ERROR: "min_low_pfn" [drivers/md/dm-crypt.ko] undefined!
ERROR: "min_low_pfn" [drivers/net/wireless/ath/ath6kl/ath6kl_sdio.ko] undefined!
ERROR: "min_low_pfn" [crypto/tcrypt.ko] undefined!
ERROR: "min_low_pfn" [crypto/asymmetric_keys/asym_tpm.ko] undefined!

Mike had/has an alternate patch for Microblaze:
https://lore.kernel.org/lkml/20200630111519.GA1951986@linux.ibm.com/

David suggested just exporting min_low_pfn & max_low_pfn in
mm/memblock.c:
https://lore.kernel.org/lkml/alpine.DEB.2.22.394.2006291911220.1118534@chino.kir.corp.google.com/

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Michal Simek <michal.simek@xilinx.com>
---
arch/microblaze/mm/init.c | 3 +++
1 file changed, 3 insertions(+)

--- linux-next-20200825.orig/arch/microblaze/mm/init.c
+++ linux-next-20200825/arch/microblaze/mm/init.c
@@ -46,6 +46,9 @@ unsigned long memory_size;
EXPORT_SYMBOL(memory_size);
unsigned long lowmem_size;

+EXPORT_SYMBOL(min_low_pfn);
+EXPORT_SYMBOL(max_low_pfn);
+
#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
EXPORT_SYMBOL(kmap_pte);
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