Keep hashed user tokens, with the following changes:

32-bit physical device addresses are mapped directly to user-tokens. No
    duplicate maps are allowed, and the addresses are assumed to be outside
    of the range 0x10000000 through 0x30000000. The user-token is identical
    to the 32-bit physical start-address of the map.
64-bit physical device addressed are mapped to user-tokens in the range
0x10000000 to 0x30000000 with page-size increments. The user_token should
    not be interpreted as an address.
Other map types, like upcoming TTM maps are mapped to user-tokens in the
    range
0x10000000 to 0x30000000 with page-size increments. The user_token should
    not be interpreted as an address.
This keeps compatibility with buggy drivers, while still implementing a
    hashed map lookup. The SiS and via device driver major bumps are
    reverted.

1 files changed, 2 insertions, 4 deletions

diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index 93037bda..19866dca 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -70,8 +70,7 @@ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
 	if (!dev->agp || !dev->agp->cant_use_aperture)
 		goto vm_nopage_error;
 
-        if (drm_ht_find_item(&dev->map_hash, (VM_OFFSET(vma) - DRM_MAP_HASH_OFFSET) >> PAGE_SHIFT,  
-                             &hash)) 
+        if (drm_ht_find_item(&dev->map_hash, VM_OFFSET(vma), &hash)) 
                 goto vm_nopage_error;
 
         r_list = drm_hash_entry(hash, drm_map_list_t, hash);
@@ -575,8 +574,7 @@ int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 	    )
 		return drm_mmap_dma(filp, vma);
 
-        if (drm_ht_find_item(&dev->map_hash, (VM_OFFSET(vma) - DRM_MAP_HASH_OFFSET) >> PAGE_SHIFT,
-                             &hash)) {
+        if (drm_ht_find_item(&dev->map_hash, VM_OFFSET(vma), &hash)) {
                 DRM_ERROR("Could not find map\n");
 		return -EINVAL;
         }