Remove unused variable in get_unmapped_area

[sfrench/cifs-2.6.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index cc3a208194576482bb6f94223ba522c35daeed14..cc1f543eb1b85e1ddfce5927704f9763f3d74233 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -29,6 +29,7 @@
 #include <asm/uaccess.h>
 #include <asm/cacheflush.h>
 #include <asm/tlb.h>
+#include <asm/mmu_context.h>
 
 #ifndef arch_mmap_check
 #define arch_mmap_check(addr, len, flags)      (0)
@@ -299,6 +300,8 @@ static int browse_rb(struct rb_root *root)
                        printk("vm_end %lx < vm_start %lx\n", vma->vm_end, vma->vm_start);
                i++;
                pn = nd;
+               prev = vma->vm_start;
+               pend = vma->vm_end;
        }
        j = 0;
        for (nd = pn; nd; nd = rb_prev(nd)) {
@@ -1197,6 +1200,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
        if (len > TASK_SIZE)
                return -ENOMEM;
 
+       if (flags & MAP_FIXED)
+               return addr;
+
        if (addr) {
                addr = PAGE_ALIGN(addr);
                vma = find_vma(mm, addr);
@@ -1270,6 +1276,9 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
        if (len > TASK_SIZE)
                return -ENOMEM;
 
+       if (flags & MAP_FIXED)
+               return addr;
+
        /* requesting a specific address */
        if (addr) {
                addr = PAGE_ALIGN(addr);
@@ -1357,39 +1366,21 @@ unsigned long
 get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
                unsigned long pgoff, unsigned long flags)
 {
-       unsigned long ret;
-
-       if (!(flags & MAP_FIXED)) {
-               unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
-
-               get_area = current->mm->get_unmapped_area;
-               if (file && file->f_op && file->f_op->get_unmapped_area)
-                       get_area = file->f_op->get_unmapped_area;
-               addr = get_area(file, addr, len, pgoff, flags);
-               if (IS_ERR_VALUE(addr))
-                       return addr;
-       }
+       unsigned long (*get_area)(struct file *, unsigned long,
+                                 unsigned long, unsigned long, unsigned long);
+
+       get_area = current->mm->get_unmapped_area;
+       if (file && file->f_op && file->f_op->get_unmapped_area)
+               get_area = file->f_op->get_unmapped_area;
+       addr = get_area(file, addr, len, pgoff, flags);
+       if (IS_ERR_VALUE(addr))
+               return addr;
 
        if (addr > TASK_SIZE - len)
                return -ENOMEM;
        if (addr & ~PAGE_MASK)
                return -EINVAL;
-       if (file && is_file_hugepages(file))  {
-               /*
-                * Check if the given range is hugepage aligned, and
-                * can be made suitable for hugepages.
-                */
-               ret = prepare_hugepage_range(addr, len, pgoff);
-       } else {
-               /*
-                * Ensure that a normal request is not falling in a
-                * reserved hugepage range.  For some archs like IA-64,
-                * there is a separate region for hugepages.
-                */
-               ret = is_hugepage_only_range(current->mm, addr, len);
-       }
-       if (ret)
-               return -EINVAL;
+
        return addr;
 }
 
@@ -1977,6 +1968,9 @@ void exit_mmap(struct mm_struct *mm)
        unsigned long nr_accounted = 0;
        unsigned long end;
 
+       /* mm's last user has gone, and its about to be pulled down */
+       arch_exit_mmap(mm);
+
        lru_add_drain();
        flush_cache_mm(mm);
        tlb = tlb_gather_mmu(mm, 1);
@@ -2101,3 +2095,75 @@ int may_expand_vm(struct mm_struct *mm, unsigned long npages)
                return 0;
        return 1;
 }
+
+
+static struct page *special_mapping_nopage(struct vm_area_struct *vma,
+                                          unsigned long address, int *type)
+{
+       struct page **pages;
+
+       BUG_ON(address < vma->vm_start || address >= vma->vm_end);
+
+       address -= vma->vm_start;
+       for (pages = vma->vm_private_data; address > 0 && *pages; ++pages)
+               address -= PAGE_SIZE;
+
+       if (*pages) {
+               struct page *page = *pages;
+               get_page(page);
+               return page;
+       }
+
+       return NOPAGE_SIGBUS;
+}
+
+/*
+ * Having a close hook prevents vma merging regardless of flags.
+ */
+static void special_mapping_close(struct vm_area_struct *vma)
+{
+}
+
+static struct vm_operations_struct special_mapping_vmops = {
+       .close = special_mapping_close,
+       .nopage = special_mapping_nopage,
+};
+
+/*
+ * Called with mm->mmap_sem held for writing.
+ * Insert a new vma covering the given region, with the given flags.
+ * Its pages are supplied by the given array of struct page *.
+ * The array can be shorter than len >> PAGE_SHIFT if it's null-terminated.
+ * The region past the last page supplied will always produce SIGBUS.
+ * The array pointer and the pages it points to are assumed to stay alive
+ * for as long as this mapping might exist.
+ */
+int install_special_mapping(struct mm_struct *mm,
+                           unsigned long addr, unsigned long len,
+                           unsigned long vm_flags, struct page **pages)
+{
+       struct vm_area_struct *vma;
+
+       vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
+       if (unlikely(vma == NULL))
+               return -ENOMEM;
+
+       vma->vm_mm = mm;
+       vma->vm_start = addr;
+       vma->vm_end = addr + len;
+
+       vma->vm_flags = vm_flags | mm->def_flags;
+       vma->vm_page_prot = protection_map[vma->vm_flags & 7];
+
+       vma->vm_ops = &special_mapping_vmops;
+       vma->vm_private_data = pages;
+
+       if (unlikely(insert_vm_struct(mm, vma))) {
+               kmem_cache_free(vm_area_cachep, vma);
+               return -ENOMEM;
+       }
+
+       mm->total_vm += len >> PAGE_SHIFT;
+
+       return 0;
+}