Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...

[~andy/linux] / drivers / gpu / drm / ttm / ttm_bo_vm.c

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 801231c9ae483980afe0e93a0af73a7f07123864..0ce48e5a9cb4a70b56461f0ceb529e2c48ed58aa 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -339,11 +339,13 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
        vma->vm_private_data = bo;
 
        /*
-        * PFNMAP is faster than MIXEDMAP due to reduced page
-        * administration. So use MIXEDMAP only if private VMA, where
-        * we need to support COW.
+        * We'd like to use VM_PFNMAP on shared mappings, where
+        * (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
+        * but for some reason VM_PFNMAP + x86 PAT + write-combine is very
+        * bad for performance. Until that has been sorted out, use
+        * VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
         */
-       vma->vm_flags |= (vma->vm_flags & VM_SHARED) ? VM_PFNMAP : VM_MIXEDMAP;
+       vma->vm_flags |= VM_MIXEDMAP;
        vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
        return 0;
 out_unref:
@@ -359,7 +361,7 @@ int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
 
        vma->vm_ops = &ttm_bo_vm_ops;
        vma->vm_private_data = ttm_bo_reference(bo);
-       vma->vm_flags |= (vma->vm_flags & VM_SHARED) ? VM_PFNMAP : VM_MIXEDMAP;
+       vma->vm_flags |= VM_MIXEDMAP;
        vma->vm_flags |= VM_IO | VM_DONTEXPAND;
        return 0;
 }