They don't make much difference: the easier fix is use gcc 4.8 which drops stack required across virtio block's virtio_queue_rq down to that kmalloc in virtio_ring from 528 to 392 bytes. Still, these (*lightly tested*) patches reduce to 432 bytes, even for gcc 4.6.4. Posted here FYI. Cheers, Rusty. -- 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>