From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH v4 0/7] kernel tinification: optionally compile out splice family of syscalls (splice, vmsplice, tee and sendfile) Date: Tue, 25 Nov 2014 14:27:41 -0500 (EST) Message-ID: <20141125.142741.1620673255148724338.davem@davemloft.net> References: <20141125185310.GA24891@cloud> <20141125.140441.401150380839514113.davem@davemloft.net> <87egsr9jkz.fsf@x220.int.ebiederm.org> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <87egsr9jkz.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org Cc: josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org, rdunlap-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, pieter-qeJ+1H9vRZbz+pZb47iToQ@public.gmane.org, alexander.h.duyck-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org, ast-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, beber-2YnHqweIUXrk1uMJSBkQmQ@public.gmane.org, catalina.mocanu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, dborkman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, fabf-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org, fuse-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org, hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, iulia.manda21-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, JBeulich-IBi9RG/b67k@public.gmane.org, bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org, jlayton-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, mcgrof-IBi9RG/b67k@public.gmane.org, mattst88-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, mgorman-l3A5Bk7waGM@public.gmane.org, mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, Paul.Durrant-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org, paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, pefoley2-lY0TAiDIAFlBDgjK7y7TUQ@public.gmane.org, tgraf-G/eBtMaohhA@public.gmane.org, therbert-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, trond.myklebust-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org, willemb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, xiaoguangrong-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, zhe List-Id: linux-api@vger.kernel.org From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman) Date: Tue, 25 Nov 2014 13:16:44 -0600 > David Miller writes: > >> From: josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org >> Date: Tue, 25 Nov 2014 10:53:10 -0800 >> >>> It's not a "slippery slope"; it's been our standard practice for ages. >> >> We've never put an entire class of generic system calls behind >> a config option. > > CONFIG_SYSVIPC has been in the kernel as long as I can remember. > > I seem to remember a plan to remove that code once userspace had > finished migrating to more unixy interfaces to ipc. But in 20 years > that migration does does not seem to have finished, or even look > like it ever will. > > But if we started a slippery slope it was long long ago. Fair enough. Would be amusing if these tiny systems have it enabled.