Introduce CONFIG_VIRT_TO_BUS

[linux-2.6-microblaze.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index 68b9ad2..144b4a2 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -894,14 +894,11 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
                        unsigned long flags, unsigned long pgoff)
 {
        struct mm_struct * mm = current->mm;
-       struct vm_area_struct * vma, * prev;
        struct inode *inode;
        unsigned int vm_flags;
-       int correct_wcount = 0;
        int error;
-       struct rb_node ** rb_link, * rb_parent;
        int accountable = 1;
-       unsigned long charged = 0, reqprot = prot;
+       unsigned long reqprot = prot;
 
        /*
         * Does the application expect PROT_READ to imply PROT_EXEC?
@@ -1023,10 +1020,28 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
                }
        }
 
-       error = security_file_mmap(file, reqprot, prot, flags);
+       error = security_file_mmap(file, reqprot, prot, flags, addr, 0);
        if (error)
                return error;
-               
+
+       return mmap_region(file, addr, len, flags, vm_flags, pgoff,
+                          accountable);
+}
+EXPORT_SYMBOL(do_mmap_pgoff);
+
+unsigned long mmap_region(struct file *file, unsigned long addr,
+                         unsigned long len, unsigned long flags,
+                         unsigned int vm_flags, unsigned long pgoff,
+                         int accountable)
+{
+       struct mm_struct *mm = current->mm;
+       struct vm_area_struct *vma, *prev;
+       int correct_wcount = 0;
+       int error;
+       struct rb_node **rb_link, *rb_parent;
+       unsigned long charged = 0;
+       struct inode *inode =  file ? file->f_path.dentry->d_inode : NULL;
+
        /* Clear old maps */
        error = -ENOMEM;
 munmap_back:
@@ -1175,8 +1190,6 @@ unacct_error:
        return error;
 }
 
-EXPORT_SYMBOL(do_mmap_pgoff);
-
 /* Get an address range which is currently unmapped.
  * For shmat() with addr=0.
  *
@@ -1536,9 +1549,14 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
         * vma->vm_start/vm_end cannot change under us because the caller
         * is required to hold the mmap_sem in read mode.  We need the
         * anon_vma lock to serialize against concurrent expand_stacks.
+        * Also guard against wrapping around to address 0.
         */
-       address += 4 + PAGE_SIZE - 1;
-       address &= PAGE_MASK;
+       if (address < PAGE_ALIGN(address+4))
+               address = PAGE_ALIGN(address+4);
+       else {
+               anon_vma_unlock(vma);
+               return -ENOMEM;
+       }
        error = 0;
 
        /* Somebody else might have raced and expanded it already */