On Wed, Jun 16, 2010 at 09:39:58AM +0900, KAMEZAWA Hiroyuki wrote: > Hmm. But I don't expect copy_from/to_user is called in very deep stack. Actually it is. The poll code mentioned earlier in this thread is just want nasty example. I'm pretty sure there are tons of others in ioctl code, as various ioctl implementations have been found to be massive stack hogs in the past, even worse for out of tree drivers. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>