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Drivers like vmwgfx may want to test whether the dma page pool is present or not. Since it's activated by default by TTM if compiled-in, define a hidden configuration option that the driver can test for. Cc: Christian König <christian.koenig@amd.com> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Christian König <christian.koenig@amd.com>