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Date: Sun, 6 Sep 2020 12:33:08 -0700 From: Randy Dunlap <rdunlap@...radead.org> To: LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org> Cc: Michal Nazarewicz <mina86@...a86.com>, Wen Congyang <wency@...fujitsu.com>, Michal Simek <monstr@...str.eu>, Christoph Hellwig <hch@....de>, Mike Rapoport <rppt@...ux.ibm.com>, kernel test robot <lkp@...el.com> Subject: [PATCH] <linux/page-isolation.h>: provide stubs for MEMORY_ISOLATION not set (for Microblaze) From: Randy Dunlap <rdunlap@...radead.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@...el.com> Signed-off-by: Randy Dunlap <rdunlap@...radead.org> Cc: Michal Nazarewicz <mina86@...a86.com> Cc: Wen Congyang <wency@...fujitsu.com> Cc: Michal Simek <monstr@...str.eu> Cc: Christoph Hellwig <hch@....de> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Mike Rapoport <rppt@...ux.ibm.com> Cc: linux-mm@...ck.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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