> > > The __access_ok macro in include/asm-mips64/uaccess.h and the > > > check_axs macro in arch/mips64/kernel/unaligned.c ... is a copy > > > from the 32-bit kernel... > > > > > > The area between USEG (XUSEG) and KSEG0 will in 64-bit > > > addressing mode generate an address error, if accessed. I'd like to be clear about the consequences of this. Presumably the 'access_ok()' macro is used to check addresses which were (originally) provided by a user program's system call. Carsten, are you saying that if such an address is set to say 2**41 in a CPU supporting 40-bit user virtual addresses, that the kernel will crash? If so, that seems to require a fix, even if we don't know a very efficient one. But perhaps any problem is a bit more subtle than that? -- Dominic Sweetman MIPS Technologies The Fruit Farm, Ely Road, Chittering, CAMBS CB5 9PH, ENGLAND phone +44 1223 706205/fax +44 1223 706250/swbrd +44 1223 706200 http://www.algor.co.uk
