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

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Message-ID: <20130523231336.GS18614@n2100.arm.linux.org.uk>
Date:	Fri, 24 May 2013 00:13:36 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kim Phillips <kim.phillips@...escale.com>
Cc:	"Woodhouse, David" <david.woodhouse@...el.com>,
	Nicolas Pitre <nico@...xnic.net>,
	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 Thu, May 23, 2013 at 11:46:54AM -0500, 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>
> ---
> resending as v6 appears to have fallen though the cracks.  Russell?

Please put it in the patch system (otherwise I do drop patches.)
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