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

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Message-id: <alpine.LFD.2.02.1302081745500.6300@xanadu.home>
Date:	Fri, 08 Feb 2013 17:47:33 -0500 (EST)
From:	Nicolas Pitre <nico@...xnic.net>
To:	"Woodhouse, David" <david.woodhouse@...el.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Kim Phillips <kim.phillips@...escale.com>,
	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 Fri, 8 Feb 2013, Woodhouse, David wrote:

> On Fri, 2013-02-08 at 15:04 -0500, Nicolas Pitre wrote:
> > On Fri, 8 Feb 2013, Woodhouse, David wrote:
> > 
> > > On Thu, 2013-02-07 at 18:13 +0000, Russell King - ARM Linux wrote:
> > > > 
> > > > However, the biggest reason not to use libgcc is that we want to control
> > > > what gets used in the kernel - for example, no floating point, and no
> > > > use of 64 x 64bit division.
> > > 
> > > Which is all very sensible. But there's no particular reason we couldn't
> > > add a __bswap[sd]i2 to the kernel's version of libgcc if we wanted to.
> > 
> > Absolutely.
> 
> And then ARM can just set ARCH_USE_BUILTIN_BSWAP like other
> architectures do, right?

If that turns out to be beneficial over what we have now, then yes.
I didn't read back the whole thread to form an opinion though.


Nicolas
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