spare archs without time32 legacy the cost of ioctl fallback conversions

adding this condition makes the entire convert_ioctl_struct function
and compat_map table statically unreachable, and thereby optimized out
by dead code elimination, on archs where they are not needed.

diff --git a/src/misc/ioctl.c b/src/misc/ioctl.c
index aa748fb8184301c052c41adda1e01c96b535fe1d..8947751147a209f61222d68893a2030bdcfe557a 100644 (file)
--- a/src/misc/ioctl.c
+++ b/src/misc/ioctl.c
@@ -120,7 +120,7 @@ int ioctl(int fd, int req, ...)
        arg = va_arg(ap, void *);
        va_end(ap);
        int r = __syscall(SYS_ioctl, fd, req, arg);
-       if (req && r==-ENOTTY) {
+       if (SIOCGSTAMP != SIOCGSTAMP_OLD && req && r==-ENOTTY) {
                for (int i=0; i<sizeof compat_map/sizeof *compat_map; i++) {
                        if (compat_map[i].new_req != req) continue;
                        union {