[PATCH] Switch s390 to NO_IOMEM

Martin Schwidefsky wrote:
  "s390 does not even need (in|out)b(_p|).  I wondered what else from
   io.h do we not need.  The answer is: almost nothing.  With the devres
   patch from Al and the dma-mapping patch from Heiko we can get rid of
   iomem and all associated definitions."

So we'll just need to replace NO_IOPORT with NO_IOMEM in Kconfig and
kill arch/s390/mm/ioremap.c.

BTW, there's an annoying bit of junk in there - IO_SPACE_LIMIT.  We
only need it for /proc/ioports, which AFAICS shouldn't even be there
on s390 (or uml).  OTOH, removing that thing would mean a user-visible
change - we go from "empty file in /proc" to "no such file in /proc"...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/s390/Kconfig

@@ -41,7 +41,7 @@ config GENERIC_HWEIGHT
 config GENERIC_TIME
 	def_bool y
 
-config NO_IOPORT
+config NO_IOMEM
 	def_bool y
 
 mainmenu "Linux Kernel Configuration"

arch/s390/mm/Makefile

@@ -2,6 +2,6 @@
 # Makefile for the linux s390-specific parts of the memory manager.
 #
 
-obj-y	 := init.o fault.o ioremap.o extmem.o mmap.o vmem.o
+obj-y	 := init.o fault.o extmem.o mmap.o vmem.o
 obj-$(CONFIG_CMM) += cmm.o
 

include/asm-s390/io.h

@@ -13,7 +13,6 @@
 
 #ifdef __KERNEL__
 
-#include <linux/vmalloc.h>
 #include <asm/page.h>
 
 #define IO_SPACE_LIMIT 0xffffffff
@@ -41,70 +40,6 @@ static inline void * phys_to_virt(unsigned long address)
         return __io_virt(address);
 }
 
-extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
-
-static inline void * ioremap (unsigned long offset, unsigned long size)
-{
-        return __ioremap(offset, size, 0);
-}
-
-/*
- * This one maps high address device memory and turns off caching for that area.
- * it's useful if some control registers are in such an area and write combining
- * or read caching is not desirable:
- */
-static inline void * ioremap_nocache (unsigned long offset, unsigned long size)
-{
-        return __ioremap(offset, size, 0);
-}
-
-extern void iounmap(void *addr);
-
-/*
- * IO bus memory addresses are also 1:1 with the physical address
- */
-#define virt_to_bus virt_to_phys
-#define bus_to_virt phys_to_virt
-
-/*
- * readX/writeX() are used to access memory mapped devices. On some
- * architectures the memory mapped IO stuff needs to be accessed
- * differently.
- */
-
-#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
-#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
-#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
-#define readq(addr) (*(volatile unsigned long long *) __io_virt(addr))
-
-#define readb_relaxed(addr) readb(addr)
-#define readw_relaxed(addr) readw(addr)
-#define readl_relaxed(addr) readl(addr)
-#define readq_relaxed(addr) readq(addr)
-#define __raw_readb readb
-#define __raw_readw readw
-#define __raw_readl readl
-#define __raw_readq readq
-
-#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
-#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
-#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
-#define writeq(b,addr) (*(volatile unsigned long long *) __io_virt(addr) = (b))
-#define __raw_writeb writeb
-#define __raw_writew writew
-#define __raw_writel writel
-#define __raw_writeq writeq
-
-#define memset_io(a,b,c)        memset(__io_virt(a),(b),(c))
-#define memcpy_fromio(a,b,c)    memcpy((a),__io_virt(b),(c))
-#define memcpy_toio(a,b,c)      memcpy(__io_virt(a),(b),(c))
-
-#define inb_p(addr) readb(addr)
-#define inb(addr) readb(addr)
-
-#define outb(x,addr) ((void) writeb(x,addr))
-#define outb_p(x,addr) outb(x,addr)
-
 #define mmiowb()	do { } while (0)
 
 /*