Work around architectures having statfs.f_type defined as long

[thirdparty/mdadm.git] / util.c

diff --git a/util.c b/util.c
index e32d97a011e7a791870f1015830a363e19167a0e..afb2bb110f24cf65c4cdd23bed3f23dc2db0c884 100644 (file)
--- a/util.c
+++ b/util.c
@@ -1946,9 +1946,13 @@ int in_initrd(void)
 {
        /* This is based on similar function in systemd. */
        struct statfs s;
+       /* statfs.f_type is signed long on s390x and MIPS, causing all
+          sorts of sign extension problems with RAMFS_MAGIC being
+          defined as 0x858458f6 */
        return  statfs("/", &s) >= 0 &&
                ((unsigned long)s.f_type == TMPFS_MAGIC ||
-                (unsigned long)s.f_type == RAMFS_MAGIC);
+                ((unsigned long)s.f_type & 0xFFFFFFFFUL) ==
+                ((unsigned long)RAMFS_MAGIC & 0xFFFFFFFFUL));
 }
 
 void reopen_mddev(int mdfd)