I get this error :
CC arch/sparc64/kernel/ioctl32.o
include/asm/uaccess.h: In function `siocdevprivate_ioctl':
fs/compat_ioctl.c:648: warning: ignoring return value of `copy_to_user', declared with attribute warn_unused_result
fs/compat_ioctl.c: In function `put_dirent32':
fs/compat_ioctl.c:2346: warning: ignoring return value of `copy_to_user', declared with attribute warn_unused_result
fs/compat_ioctl.c: In function `serial_struct_ioctl':
fs/compat_ioctl.c:2489: warning: ignoring return value of `copy_from_user', declared with attribute warn_unused_result
fs/compat_ioctl.c:2502: warning: ignoring return value of `copy_to_user', declared with attribute warn_unused_result
make[1]: *** [arch/sparc64/kernel/ioctl32.o] Error 1
gcc is 3.4, 64bit. That's ultra5.