linux-kernel - Re: [RFC] arm: use built-in byte swap function

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Date:	Wed, 20 Feb 2013 10:43:18 -0500 (EST)
From:	Nicolas Pitre <nico@...xnic.net>
To:	"Woodhouse, David" <david.woodhouse@...el.com>
Cc:	Kim Phillips <kim.phillips@...escale.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Santos <daniel.santos@...ox.com>,
	David Rientjes <rientjes@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robherring2@...il.com>
Subject: Re: [RFC] arm: use built-in byte swap function

On Wed, 20 Feb 2013, Woodhouse, David wrote:

> On Wed, 2013-02-20 at 09:06 -0500, Nicolas Pitre wrote:
> > On Wed, 20 Feb 2013, Woodhouse, David wrote:
> > 
> > > On Wed, 2013-02-20 at 08:36 -0500, Nicolas Pitre wrote:
> > > > You'll have the same issue wrt the above whether or not the source
> > > > file is C or assembly.
> > > 
> > > Hm, true. I was thinking of the code itself (which is
> > > position-independent anyway), rather than the flags in the object file.
> > > 
> > > So just ship a .S file and for the decompressor (if we need it at all)
> > > rebuild it just the same as we do the *other* libgcc code like ashldi3.S
> > > etc.
> > 
> > ... in which case there is no harm shipping a .c file and trivially 
> > enforcing -O2, the rest being equal.
> 
> For today's compilers, unless the wind changes.

We'll adapt if necessary.  Going with -O2 should remain pretty safe anyway.


Nicolas
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