linux-kernel - Re: [PATCH v6] arm: use built-in byte swap function

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Date:	Sat, 23 Feb 2013 23:20:56 +0000
From:	"Woodhouse, David" <david.woodhouse@...el.com>
To:	Kim Phillips <kim.phillips@...escale.com>
CC:	Nicolas Pitre <nico@...xnic.net>,
	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 v6] arm: use built-in byte swap function

On Fri, 2013-02-22 at 19:40 -0600, 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 tiny benefit on vmlinux size (Linaro gcc 4.7.3):
> 
>    text    data     bss     dec     hex filename
> 2754100  121144   56520 2931764  2cbc34 vmlinux-lart #orig
> 2754050  121144   56520 2931714  2cbc02 vmlinux-lart #builtin-bswap
> 6282699  307852 5578076 12168627 b9adb3 vmlinux-mxs #orig
> 6282241  307832 5578076 12168149 b9abd5 vmlinux-mxs #builtin-bswap
> 7200193  364180  361748 7926121  78f169 vmlinux-imx_v6_v7 #orig
> 7199515  364188  361748 7925451  78eecb vmlinux-imx_v6_v7 #builtin-bswap
> 
> Signed-off-by: Kim Phillips <kim.phillips@...escale.com>

Looks good, thanks.

Acked-by: David Woodhouse <David.Woodhouse@...el.com>


-- 
                   Sent with MeeGo's ActiveSync support.

David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation




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