vfs_mountroot_try
!vfs_mountroot_try(ROOTDEVNAME))
if (!vfs_mountroot_try(cdrom_rootdevnames[i]))
if (!vfs_mountroot_try(kgetenv("vfs.root.mountfrom")))
if (!vfs_mountroot_try(""))
if (rootdevnames[0] && !vfs_mountroot_try(rootdevnames[0]))
if (rootdevnames[1] && !vfs_mountroot_try(rootdevnames[1]))
if (!vfs_mountroot_try(ROOTDEVNAME))
} else if (vfs_mountroot_try(name) == 0) {
static int vfs_mountroot_try(const char *mountfrom);