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    Subject[PATCH] drm: make sure page protections are updated after changing vm_flags.
    Some architectures compute ->vm_page_prot depending on ->vm_flags, so
    we need to update the protections after adjusting the flags.

    Reported-by: Jan Beulich <>
    Signed-off-by: Jeremy Fitzhardinge <>

    diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
    index 8104eca..9d3e39f 100644
    --- a/drivers/gpu/drm/drm_gem.c
    +++ b/drivers/gpu/drm/drm_gem.c
    @@ -537,7 +537,7 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
    vma->vm_ops = obj->dev->driver->gem_vm_ops;
    vma->vm_private_data = map->handle;
    /* FIXME: use pgprot_writecombine when available */
    - vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
    + vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));

    /* Take a ref for this mapping of the object, so that the fault
    * handler can dereference the mmap offset's pointer to the object.

     \ /
      Last update: 2009-10-01 01:03    [W:0.021 / U:18.892 seconds]
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