Date: Sun, 23 Nov 2014 11:43:26 -0800
From: Josh Triplett <josh@joshtriplett.org>
To: David Miller <davem@davemloft.net>
Cc: pieter@boesman.nl, alexander.h.duyck@intel.com, viro@zeniv.linux.org.uk,
        ast@plumgrid.com, akpm@linux-foundation.org, beber@meleeweb.net,
        catalina.mocanu@gmail.com, dborkman@redhat.com, edumazet@google.com,
        ebiederm@xmission.com, fabf@skynet.be,
        fuse-devel@lists.sourceforge.net, geert@linux-m68k.org,
        hughd@google.com, iulia.manda21@gmail.com, JBeulich@suse.com,
        bfields@fieldses.org, jlayton@poochiereds.net,
        linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, mcgrof@suse.com, mattst88@gmail.com,
        mgorman@suse.de, mst@redhat.com, miklos@szeredi.hu,
        netdev@vger.kernel.org, oleg@redhat.com, Paul.Durrant@citrix.com,
        paulmck@linux.vnet.ibm.com, pefoley2@pefoley.com, tgraf@suug.ch,
        therbert@google.com, willemb@google.com,
        xiaoguangrong@linux.vnet.ibm.com, zhenglong.cai@cs2c.com.cn
Subject: Re: [PATCH 0/6] kernel tinification: optionally compile out splice
 family of syscalls (splice, vmsplice, tee and sendfile)
Message-ID: <20141123194326.GB8517@thin>
References: <1416752468-1626-1-git-send-email-pieter@boesman.nl>
 <20141123.134623.2061031332250984539.davem@davemloft.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20141123.134623.2061031332250984539.davem@davemloft.net>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org

On Sun, Nov 23, 2014 at 01:46:23PM -0500, David Miller wrote:
> Truly removing sendfile/sendpage means that you can't even compile NFS
> into the tree.

If you mean the in-kernel nfsd (CONFIG_NFSD), that already has a large
stack of "select" and "depends on", both directly and indirectly; adding
a "select SPLICE_SYSCALL" to it seems fine.  (That select does need
adding, though.  Pieter, you need to test-compile more than just
tinyconfig and defconfig.  Try an allyesconfig with *just* splice turned
off, and make sure that compiles.)

Given the requirements of running a file server in the kernel, I'd
expect CONFIG_NFSD to end up with several more selects of optional
functionality in the future.  It seems rather likely that the average
embedded system will be compiling out NFS. :)

Also, this patch series compiles out splice and sendfile, including
several *users* of sendpage; it doesn't compile out the sendpage
support/infrastructure itself.

- Josh Triplett
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/