Commit fba5261e0039 ("mm: replace free hugepage folios after migration") on mm-unstable that also available at https://lkml.kernel.org/r/1734503588-16254-1-git-send-email-yangge1116@xxxxxxx breaks build when CONFIG_HUGETLB_PAGE=n as below, since replace_free_hugepage_folios() is defined on the header as non-inline. Fix it. ./tools/testing/kunit/kunit.py run --kunitconfig mm/damon/tests --build_dir ../kunit.out [...] ld: io_uring/rsrc.o: in function `replace_free_hugepage_folios': rsrc.c:(.text+0x160): multiple definition of `replace_free_hugepage_folios'; kernel/fork.o:fork.c:(.text+0xc30): first defined here [...] make: *** [Makefile:251: __sub-make] Error 2 Fixes: fba5261e0039 ("mm: replace free hugepage folios after migration") Signed-off-by: SeongJae Park <sj@xxxxxxxxxx> --- include/linux/hugetlb.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 7d36ac8df97f..10faf42ca96a 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -1060,7 +1060,8 @@ static inline int isolate_or_dissolve_huge_page(struct page *page, return -ENOMEM; } -int replace_free_hugepage_folios(unsigned long start_pfn, unsigned long end_pfn) +static inline int replace_free_hugepage_folios(unsigned long start_pfn, + unsigned long end_pfn) { return 0; } -- 2.39.5