Well, this is fortuitous.  From the kernel mailing list:

>From: Pieter Smith <pie...@boesman.nl>
>Subject: [PATCH 2/2] fs: Support compiling out sendfile
>Date: Mon, 20 Oct 2014 23:48:37 +0200
>
>Many embedded systems will not need this syscall, and omitting it
>saves space.  Add a new EXPERT config option CONFIG_SENDFILE_SYSCALL
>(default y) to support compiling it out.

There's a pleasing symmetry that while BusyBox gains the ability to
configure in sendfile the kernel gains the ability to configure it out.

Ron
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