Happily noted that the patch for 2.6.23 came very fast. But sadly:
milch linux-2.6.23 # LC_ALL=C LANG=C make
CHK include/linux/version.h
CHK include/linux/utsrelease.h
CALL scripts/checksyscalls.sh
CHK include/linux/compile.h
CC arch/x86_64/kernel/ioport.o
arch/x86_64/kernel/ioport.c: In function 'sys_ioperm':
arch/x86_64/kernel/ioport.c:47: error: implicit declaration of function 'gr_handle_ioperm'
arch/x86_64/kernel/ioport.c: In function 'sys_iopl':
arch/x86_64/kernel/ioport.c:123: error: implicit declaration of function 'gr_handle_iopl'
make[1]: *** [arch/x86_64/kernel/ioport.o] Error 1
make: *** [arch/x86_64/kernel] Error 2