ADDR_LIMIT_32BIT
#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
if (current->personality & ADDR_LIMIT_32BIT) \
personality &= ~ADDR_LIMIT_32BIT;
personality |= ADDR_LIMIT_32BIT;
PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT,