Hi all- I'm trying to get rid of x86's dynamic TASK_SIZE and just redefine it to TASK_SIZE_MAX. So far, these are the TASK_SIZE users that actually seem to care about the task in question: get_unmapped_area. This is used by mmap, mremap, exec, uprobe XOL, and maybe some other things. - mmap, mremap, etc: IMO this should check in_compat_syscall, not TIF_ADDR32. If a 64-bit task does an explicit 32-bit mmap (using int $0x80, for example), it should get a 32-bit address back. - xol_add_vma: This one is weird: uprobes really is doing something behind the task's back, and the addresses need to be consistent with the address width. I'm not quite sure what to do here. - exec. This wants to set up mappings that are appropriate for the new task. My inclination would be add a new 'limit' parameter to all the get_unmapped_area variants and possible to vm_brk and friends and to thus push the decision into the callers. For the syscalls, we could add: static inline unsigned long this_syscall_addr_limit(void) { return TASK_SIZE; } and override it on x86. I'm not super excited to write that patch, though... --Andy -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>