linux-kernel - Re: [PATCH v7] arm: use built-in byte swap function

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Date:	Tue, 5 Nov 2013 15:45:39 -0600
From:	Kim Phillips <kim.phillips@...escale.com>
To:	Nicolas Pitre <nico@...xnic.net>
CC:	"Woodhouse, David" <david.woodhouse@...el.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: [PATCH v7] arm: use built-in byte swap function

On Sat, 26 Oct 2013 22:41:34 -0400
Nicolas Pitre <nico@...xnic.net> wrote:

> On Thu, 23 May 2013, Kim Phillips wrote:
> 
> > Enable the compiler intrinsic for byte swapping on arch ARM.  This
> > allows the compiler to detect and be able to optimize out byte
> > swappings, and has a very modest benefit on vmlinux size (Linaro gcc
> > 4.8):
> > 
> >    text	   data	    bss	    dec	    hex	filename
> > 2840310	 123932	  61960	3026202	 2e2d1a	vmlinux-lart #orig
> > 2840152	 123932	  61960	3026044	 2e2c7c	vmlinux-lart #builtin-bswap
> > 
> > 6473120	 314840	5616016	12403976 bd4508	vmlinux-mxs #orig
> > 6472586	 314848	5616016	12403450 bd42fa	vmlinux-mxs #builtin-bswap
> > 
> > 7419872	 318372	 379556	8117800	 7bde28	vmlinux-imx_v6_v7 #orig
> > 7419170	 318364	 379556	8117090	 7bdb62	vmlinux-imx_v6_v7 #builtin-bswap
> > 
> > Signed-off-by: Kim Phillips <kim.phillips@...escale.com>
> > Reviewed-by: Nicolas Pitre <nico@...aro.org>
> > Acked-by: David Woodhouse <David.Woodhouse@...el.com>
> 
> Did this ever go somewhere?
> 
> Russell suggested at the time to base it against a mainline kernel 
> (since it was patching files which apparently were already patched with 
> out-of-tree lz4 patches) and send it to his patch system.

I'll re-base and send it to his patch system.

Thanks,

Kim

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