Several architectures defined sys_ioperm but don't actually implement it:
arch/m68k/kernel/sys_m68k.c: sys_ioperm return -ENOSYS
arch/sparc/kernel/setup.c: sys_ioperm return -EIO
arch/ppc/kernel/syscalls.c: sys_ioperm printk(KERN_ERR ...) return -EIO
(vs current 2.4 bk -- 2.4.20-pre2+)
===== drivers/char/vt.c 1.10 vs edited =====
--- 1.10/drivers/char/vt.c Tue Aug 6 09:42:07 2002
+++ edited/drivers/char/vt.c Wed Aug 14 23:09:20 2002
@@ -481,7 +481,7 @@
ucval = keyboard_type;
goto setchar;
-#if defined(__i386__) || defined(__mc68000__) || defined(__ppc__) || defined(__sparc__)
+#if defined(CONFIG_X86)
/*
* These cannot be implemented on any machine that implements
* ioperm() in user level (such as Alpha PCs).