linux-kernel - [ALTERNATE PATCH] memblock: fix min_low_pfn/max_low

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Date:   Fri, 28 Aug 2020 17:01:39 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Michal Simek <monstr@...str.eu>,
        Michal Simek <michal.simek@...inx.com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: [ALTERNATE PATCH] memblock: fix min_low_pfn/max_low_pfn build errors

Export min_low_pfn & max_low_pfn in mm/memblock.c to fix build errors
on arch/microblaze/ and arch/ia64/: (e.g.)

  ERROR: "max_low_pfn" [drivers/rpmsg/virtio_rpmsg_bus.ko] undefined!
  ERROR: "min_low_pfn" [drivers/rpmsg/virtio_rpmsg_bus.ko] undefined!
  ERROR: "max_low_pfn" [drivers/mtd/spi-nor/spi-nor.ko] undefined!
  ERROR: "min_low_pfn" [drivers/mtd/spi-nor/spi-nor.ko] undefined!
  ERROR: "min_low_pfn" [drivers/mtd/nand/raw/nand.ko] undefined!
  ERROR: "max_low_pfn" [drivers/mtd/nand/raw/nand.ko] undefined!
  ERROR: "max_low_pfn" [drivers/rapidio/devices/rio_mport_cdev.ko] undefined!
  ERROR: "min_low_pfn" [drivers/rapidio/devices/rio_mport_cdev.ko] undefined!
  ERROR: "min_low_pfn" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined!
  ERROR: "max_low_pfn" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined!
  ERROR: "min_low_pfn" [drivers/crypto/cavium/nitrox/n5pf.ko] undefined!
  ERROR: "max_low_pfn" [drivers/crypto/cavium/nitrox/n5pf.ko] undefined!
  ERROR: "max_low_pfn" [drivers/md/dm-integrity.ko] undefined!
  ERROR: "min_low_pfn" [drivers/md/dm-integrity.ko] undefined!
  ERROR: "max_low_pfn" [crypto/tcrypt.ko] undefined!
  ERROR: "min_low_pfn" [crypto/tcrypt.ko] undefined!

In both arches, these variables are referenced in
arch/$ARCH/include/asm/page.h.

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@...el.com>
Suggested-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: Michal Simek <monstr@...str.eu>
Cc: Michal Simek <michal.simek@...inx.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: linux-ia64@...r.kernel.org
---
 mm/memblock.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20200825.orig/mm/memblock.c
+++ linux-next-20200825/mm/memblock.c
@@ -99,6 +99,8 @@ EXPORT_SYMBOL(contig_page_data);

 unsigned long max_low_pfn;
 unsigned long min_low_pfn;
+EXPORT_SYMBOL(min_low_pfn);
+EXPORT_SYMBOL(max_low_pfn);
 unsigned long max_pfn;
 unsigned long long max_possible_pfn;