add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/m68k/include/asm/io_mm.h
..
..
@@ -381,8 +381,6 @@
381
381
 #define writesw(port, buf, nr)    raw_outsw((port), (u16 *)(buf), (nr))
382
382
 #define writesl(port, buf, nr)    raw_outsl((port), (u32 *)(buf), (nr))
383
383
 
384
-#define mmiowb()
385
-
386
384
 #ifndef CONFIG_SUN3
387
385
 #define IO_SPACE_LIMIT 0xffff
388
386
 #else