nommu: Add new vmalloc_user() and remap_vmalloc_range() interfaces.

[Paul Mundt]

This builds on top of the earlier vmalloc_32_user() work introduced by
b50731732f926d6c49fd0724616a7344c31cd5cf, as we now have places in the
nommu allmodconfig that hit up against these missing APIs.

As vmalloc_32_user() is already implemented, this is moved over to
vmalloc_user() and simply made a wrapper. As all current nommu platforms
are 32-bit addressable, there's no special casing we have to do for
ZONE_DMA and things of that nature as per GFP_VMALLOC32.

remap_vmalloc_range() needs to check VM_USERMAP in order to figure out
whether we permit the remap or not, which means that we also have to
rework the vmalloc_user() code to grovel for the VMA and set the flag.

Signed-off-by: Paul Mundt <[EMAIL PROTECTED]>

---

 mm/nommu.c |   45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index 35622c5..c4768d0 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -10,6 +10,7 @@
  *  Copyright (c) 2000-2003 David McCullough <[EMAIL PROTECTED]>
  *  Copyright (c) 2000-2001 D Jeff Dionne <[EMAIL PROTECTED]>
  *  Copyright (c) 2002      Greg Ungerer <[EMAIL PROTECTED]>
+ *  Copyright (c) 2007      Paul Mundt <[EMAIL PROTECTED]>
  */
 
 #include <linux/module.h>
@@ -183,6 +184,26 @@ void *__vmalloc(unsigned long size, gfp_t gfp_mask, 
pgprot_t prot)
 }
 EXPORT_SYMBOL(__vmalloc);
 
+void *vmalloc_user(unsigned long size)
+{
+       void *ret;
+
+       ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
+                       PAGE_KERNEL);
+       if (ret) {
+               struct vm_area_struct *vma;
+
+               down_write(&current->mm->mmap_sem);
+               vma = find_vma(current->mm, (unsigned long)ret);
+               if (vma)
+                       vma->vm_flags |= VM_USERMAP;
+               up_write(&current->mm->mmap_sem);
+       }
+
+       return ret;
+}
+EXPORT_SYMBOL(vmalloc_user);
+
 struct page * vmalloc_to_page(void *addr)
 {
        return virt_to_page(addr);
@@ -253,10 +274,17 @@ EXPORT_SYMBOL(vmalloc_32);
  *
  * The resulting memory area is 32bit addressable and zeroed so it can be
  * mapped to userspace without leaking data.
+ *
+ * VM_USERMAP is set on the corresponding VMA so that subsequent calls to
+ * remap_vmalloc_range() are permissible.
  */
 void *vmalloc_32_user(unsigned long size)
 {
-       return __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
+       /*
+        * We'll have to sort out the ZONE_DMA bits for 64-bit,
+        * but for now this can simply use vmalloc_user() directly.
+        */
+       return vmalloc_user(size);
 }
 EXPORT_SYMBOL(vmalloc_32_user);
 
@@ -1213,6 +1241,21 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned 
long from,
 }
 EXPORT_SYMBOL(remap_pfn_range);
 
+int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
+                       unsigned long pgoff)
+{
+       unsigned int size = vma->vm_end - vma->vm_start;
+
+       if (!(vma->vm_flags & VM_USERMAP))
+               return -EINVAL;
+
+       vma->vm_start = (unsigned long)(addr + (pgoff << PAGE_SHIFT));
+       vma->vm_end = vma->vm_start + size;
+
+       return 0;
+}
+EXPORT_SYMBOL(remap_vmalloc_range);
+
 void swap_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
 {
 }
-
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