From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> [ Upstream commit ca6969013d13282b42cb5edcc13db731a08e0ad8 ] With Xen PV Display driver in use the "expected" VM_DONTEXPAND flag is not set (neither explicitly nor implicitly), so the driver hits the code path in drm_gem_mmap_obj() which triggers the WARNING. Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx> Link: https://lore.kernel.org/r/1652104303-5098-1-git-send-email-olekstysh@xxxxxxxxx Signed-off-by: Juergen Gross <jgross@xxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/gpu/drm/xen/xen_drm_front_gem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c index 5a5bf4e5b717..e31554d7139f 100644 --- a/drivers/gpu/drm/xen/xen_drm_front_gem.c +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c @@ -71,7 +71,7 @@ static int xen_drm_front_gem_object_mmap(struct drm_gem_object *gem_obj, * the whole buffer. */ vma->vm_flags &= ~VM_PFNMAP; - vma->vm_flags |= VM_MIXEDMAP; + vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND; vma->vm_pgoff = 0; /* -- 2.35.1
