linux-kernel - Re: [PATCH 51/56] drivers/char/mem: support compiling out splice

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Message-ID: <20141113233416.GC7678@kroah.com>
Date:	Thu, 13 Nov 2014 15:34:16 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	josh@...htriplett.org
Cc:	Pieter Smith <pieter@...sman.nl>, Arnd Bergmann <arnd@...db.de>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 51/56] drivers/char/mem: support compiling out splice

On Thu, Nov 13, 2014 at 02:31:50PM -0800, josh@...htriplett.org wrote:
> [Please don't top-post.]
> 
> On Thu, Nov 13, 2014 at 11:23:46PM +0100, Pieter Smith wrote:
> > Okay with moving the relevant functions to a new translation unit and
> > squashing it out in the Makefile
> 
> No, you don't need to do that either.  Mark pipe_to_null and
> splice_write_null as __maybe_unused, then wrap the initialization of
> .splice_write = splice_write_null to make it .splice_write =
> splice_p(splice_write_null).  That will avoid adding a single ifdef.

Again, ick, no.  You aren't saving anything "real" at all, just take out
the splice core code, leave the file pointer alone, and never do that
horrid "splice_p" stuff, ick ick ick.

greg k-h
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