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Subject[PATCH] <linux/page-isolation.h>: provide stubs for MEMORY_ISOLATION not set (for Microblaze)
Date
From: Randy Dunlap <rdunlap@infradead.org>

Fix build errors in Microblaze when CONFIG_MEMORY_ISOLATION is not
set/enabled by adding stubs for 3 missing functions.

Fixes these build errors:

gcc-9.3.0-nolibc/microblaze-linux/bin/microblaze-linux-ld: mm/page_alloc.o: in function `alloc_contig_range':
(.text+0xa0c0): undefined reference to `start_isolate_page_range'
gcc-9.3.0-nolibc/microblaze-linux/bin/microblaze-linux-ld: (.text+0xa2bc): undefined reference to `test_pages_isolated'
gcc-9.3.0-nolibc/microblaze-linux/bin/microblaze-linux-ld: (.text+0xa378): undefined reference to `undo_isolate_page_range'

Fixes: 0815f3d81d76 ("mm: page_isolation: MIGRATE_CMA isolation functions added") # v3.10
Fixes: b023f46813cd ("memory-hotplug: skip HWPoisoned page when offlining pages") # v3.10
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: linux-mm@kvack.org
---
include/linux/page-isolation.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

--- linux-next-20200903.orig/include/linux/page-isolation.h
+++ linux-next-20200903/include/linux/page-isolation.h
@@ -28,6 +28,22 @@ static inline bool is_migrate_isolate(in
{
return false;
}
+static inline int test_pages_isolated(unsigned long start_pfn,
+ unsigned long end_pfn, int isol_flags)
+{
+ return 0;
+}
+static inline int
+start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
+ unsigned migratetype, int flags)
+{
+ return 0;
+}
+static inline void
+undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
+ unsigned migratetype)
+{
+}
#endif

#define MEMORY_OFFLINE 0x1

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