Definition for MREMAP_DONTUNMAP is not present in glibc older than 2.32 thus throwing an undeclared error when running make on mm. Including linux/mman.h solves the build error for people having older glibc.

Fixes: 0183d777c29a ("selftests: mm: remove duplicate unneeded defines") Reported-by: Linux Kernel Functional Testing lkft@linaro.org Closes: https://lore.kernel.org/linux-mm/CA+G9fYvV-71XqpCr_jhdDfEtN701fBdG3q+=bafaZi... Tested-by: Muhammad Usama Anjum usama.anjum@collabora.com Signed-off-by: Samasth Norway Ananda samasth.norway.ananda@oracle.com --- tools/testing/selftests/mm/mremap_dontunmap.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/mm/mremap_dontunmap.c b/tools/testing/selftests/mm/mremap_dontunmap.c index ca2359835e75..a06e73ec8568 100644 --- a/tools/testing/selftests/mm/mremap_dontunmap.c +++ b/tools/testing/selftests/mm/mremap_dontunmap.c @@ -7,6 +7,7 @@ */ #define _GNU_SOURCE #include <sys/mman.h> +#include <linux/mman.h> #include <errno.h> #include <stdio.h> #include <stdlib.h>