linux-kernel - Re: [PATCH 0/6] kernel tinification: optionally compile out splice family of syscalls (splice, vmsplice, tee and sendfile)

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Date:	Sun, 23 Nov 2014 21:30:40 +0100
From:	Pieter Smith <pieter@...sman.nl>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	David Miller <davem@...emloft.net>, alexander.h.duyck@...el.com,
	viro@...iv.linux.org.uk, ast@...mgrid.com,
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Subject: Re: [PATCH 0/6] kernel tinification: optionally compile out splice
 family of syscalls (splice, vmsplice, tee and sendfile)

On Sun, Nov 23, 2014 at 11:43:26AM -0800, Josh Triplett wrote:
> 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.)

Did exacly that. Took forever on my hardware, but no problems.

> 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
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