(4/13/13 5:14 AM), Marco Stornelli wrote: > Hi, > > I was seeing the code of __mm_populate (in -next) and I've got a doubt > about the return value. The function __mlock_posix_error_return should > return a proper error for mlock, converting the return value from > __get_user_pages. It checks for EFAULT and ENOMEM. Actually > __get_user_pages could return, in addition, ERESTARTSYS and EHWPOISON.
__get_user_pages doesn't return EHWPOISON if FOLL_HWPOISON is not specified. I'm not expert ERESTARTSYS. I understand correctly, ERESTARTSYS is only returned when signal received, and signal handling routine (e.g. do_signal) modify EIP and hidden ERESTARTSYS from userland generically. > So it seems to me that we could return to user space not expected value. > I can't see them on the man page. In addition we shouldn't ever return > ERESTARTSYS to the user space but EINTR. According to the man pages > maybe we should return EAGAIN in these cases. Am I missing something? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
