uml: clean up tlb flush path

Tidy the tlb flushing code.

With tt mode gone, there is no reason to have the capability to have
called directly from do_mmap, do_mprotect, and do_munmap, rather than
calling a function pointer that it is given.

There was a large amount of data that was passed from function to
function, being used at the lowest level, without being changed.  This
stuff is now encapsulated in a structure which is initialized at the
top layer and passed down.  This simplifies the code, reduces the
amount of code needed to pass the parameters around, and saves on
stack space.

A somewhat more subtle change is the meaning of the current operation
index.  It used to start at -1, being pre-incremented when adding an
operation.  It now starts at 0, being post-incremented, with
associated adjustments of +/- 1 on comparisons.

In addition, tlb.h contained a couple of declarations which had no
users outside of tlb.c, so they could be moved or deleted.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/include/tlb.h

@@ -8,34 +8,7 @@
 
 #include "um_mmu.h"
 
-struct host_vm_op {
-	enum { NONE, MMAP, MUNMAP, MPROTECT } type;
-	union {
-		struct {
-			unsigned long addr;
-			unsigned long len;
-			unsigned int prot;
-			int fd;
-			__u64 offset;
-		} mmap;
-		struct {
-			unsigned long addr;
-			unsigned long len;
-		} munmap;
-		struct {
-			unsigned long addr;
-			unsigned long len;
-			unsigned int prot;
-		} mprotect;
-	} u;
-};
-
 extern void force_flush_all(void);
-extern void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
-                             unsigned long end_addr, int force,
-			     int (*do_ops)(struct mm_context *,
-					   struct host_vm_op *, int, int,
-					   void **));
 extern int flush_tlb_kernel_range_common(unsigned long start,
 					 unsigned long end);