set_up_x_back_buffer  162 src/xfns.c     static void set_up_x_back_buffer (struct frame *f);
set_up_x_back_buffer  847 src/xfns.c             set_up_x_back_buffer (f);
set_up_x_back_buffer 3760 src/xfns.c         set_up_x_back_buffer (f);