The sparse tool complains that the "cast removes the address space '__iomem' of expression". Avoid the cast by using the screen_buffer pointer instead of the screen_base pointer from the union. Fixes: d463633d63e6 ("fbdev: atafb: Add support for SuperVidel's SuperBlitter") Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202609261313.kgFtkz2t-lkp@intel.com/ Cc: Miro Kropáček <miro.kropacek@gmail.com> Signed-off-by: Helge Deller <deller@gmx.de>