The commit a584c7734a4d ("selftests: mm: fix map_hugetlb failure on 64K page size systems") backported the fix from v6.8 to stable v6.1. The patch uses default_huge_page_size() function, which definition moved into vm_util.[ch] by commit bd4d67e76f699 ("selftests/mm: merge default_huge_page_size() into one") merged to upsream since v6.4. However, in v6.1 common definition/declaration for the default_huge_page_size() we doesn't have, the following build error is seen:

map_hugetlb.c:79:25: warning: implicit declaration of function ‘default_huge_page_size’ [-Wimplicit-function-declaration] 79 | hugepage_size = default_huge_page_size(); | ^~~~~~~~~~~~~~~~~~~~~~ /usr/bin/ld: /tmp/ccx95BZz.o: in function `main': map_hugetlb.c:(.text+0x104): undefined reference to `default_huge_page_size'

Place default_huge_page_size() function body into map_hugetlb.c to fix this issue.

Fixes: a584c7734a4d ("selftests: mm: fix map_hugetlb failure on 64K page size systems") Signed-off-by: Andrey Kalachev kalachev@swemel.ru --- tools/testing/selftests/vm/map_hugetlb.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)

diff --git a/tools/testing/selftests/vm/map_hugetlb.c b/tools/testing/selftests/vm/map_hugetlb.c index c65c55b7a789..5826c50b6736 100644 --- a/tools/testing/selftests/vm/map_hugetlb.c +++ b/tools/testing/selftests/vm/map_hugetlb.c @@ -67,6 +67,30 @@ static int read_bytes(char *addr, size_t length) return 0; }

+/* + * default_huge_page_size copied from mlock2-tests.c + */ +unsigned long default_huge_page_size(void) +{ + unsigned long hps = 0; + char *line = NULL; + size_t linelen = 0; + FILE *f = fopen("/proc/meminfo", "r"); + + if (!f) + return 0; + while (getline(&line, &linelen, f) > 0) { + if (sscanf(line, "Hugepagesize: %lu kB", &hps) == 1) { + hps <<= 10; + break; + } + } + + free(line); + fclose(f); + return hps; +} + int main(int argc, char **argv) { void *addr;