Remove (at least temporarily) the "incomplete PFN mapping" support

With the previous commit, we can handle arbitrary shared re-mappings
even without this complexity, and since the only known private mappings
are for strange users of /dev/mem (which never create an incomplete one),
there seems to be no reason to support it.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 1 insertions, 46 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 29f02d8513f6..e5677f456742 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -163,7 +163,6 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_HUGETLB      0x00400000      /* Huge TLB Page VM */
 #define VM_NONLINEAR    0x00800000      /* Is non-linear (remap_file_pages) */
 #define VM_MAPPED_COPY  0x01000000      /* T if mapped copy of data (nommu mmap) */
-#define VM_INCOMPLETE   0x02000000      /* Strange partial PFN mapping marker */
 
 #ifndef VM_STACK_DEFAULT_FLAGS          /* arch can override this */
 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
diff --git a/mm/memory.c b/mm/memory.c
index e65f8fc8ea67..430a72ed08d5 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1228,50 +1228,6 @@ int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, struct page *
 EXPORT_SYMBOL(vm_insert_page);
 
 /*
- * Somebody does a pfn remapping that doesn't actually work as a vma.
- *
- * Do it as individual pages instead, and warn about it. It's bad form,
- * and very inefficient.
- */
-static int incomplete_pfn_remap(struct vm_area_struct *vma,
-                unsigned long start, unsigned long end,
-                unsigned long pfn, pgprot_t prot)
-{
-        static int warn = 10;
-        struct page *page;
-        int retval;
-
-        if (!(vma->vm_flags & VM_INCOMPLETE)) {
-                if (warn) {
-                        warn--;
-                        printk("%s does an incomplete pfn remapping", current->comm);
-                        dump_stack();
-                }
-        }
-        vma->vm_flags |= VM_INCOMPLETE | VM_IO | VM_RESERVED;
-
-        if (start < vma->vm_start || end > vma->vm_end)
-                return -EINVAL;
-
-        if (!pfn_valid(pfn))
-                return -EINVAL;
-
-        page = pfn_to_page(pfn);
-        if (!PageReserved(page))
-                return -EINVAL;
-
-        retval = 0;
-        while (start < end) {
-                retval = insert_page(vma->vm_mm, start, page, prot);
-                if (retval < 0)
-                        break;
-                start += PAGE_SIZE;
-                page++;
-        }
-        return retval;
-}
-
-/*
  * maps a range of physical memory into the requested pages. the old
  * mappings are removed. any references to nonexistent pages results
  * in null mappings (currently treated as "copy-on-access")
@@ -1365,7 +1321,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
          */
         if (!(vma->vm_flags & VM_SHARED)) {
                 if (addr != vma->vm_start || end != vma->vm_end)
-                        return incomplete_pfn_remap(vma, addr, end, pfn, prot);
+                        return -EINVAL;
                 vma->vm_pgoff = pfn;
         }