linux-kernel - Re: [PATCH] wireless: iwlegacy: make const array static to shink object code size Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit

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Date:   Fri, 22 Sep 2017 03:03:08 -0700
From:   Joe Perches <joe@...ches.com>
To:     Julia Lawall <julia.lawall@...6.fr>,
        Colin King <colin.king@...onical.com>
Cc:     Stanislaw Gruszka <sgruszka@...hat.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wireless: iwlegacy: make const array static to shink
 object code size Content-Type: text/plain; charset="utf-8"
 Content-Transfer-Encoding: 8bit

On Fri, 2017-09-22 at 09:23 +0200, Julia Lawall wrote:
> 
> On Thu, 21 Sep 2017, Colin King wrote:
> 
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > Don't populate const array ac_to_fifo on the stack in an inlined
> > function, instead make it static.  Makes the object code smaller
> > by over 800 bytes:
> > 
> >    text	   data	    bss	    dec	    hex	filename
> >  159029	  33154	   1216	 193399	  2f377	4965-mac.o
> > 
> >    text	   data	    bss	    dec	    hex	filename
> >  158122	  33250	   1216	 192588	  2f04c	4965-mac.o
> > 
> > (gcc version 7.2.0 x86_64)
> 
> Gcc 7 must be much more aggressive about inlining than gcc 4.  Here is the
> change that I got on this file:
> 
>      text          data     bss     dec     hex filename
> -   76346          1494     152   77992   130a8 drivers/net/wireless/intel/iwlegacy/4965-mac.o
> +   76298          1494     152   77944   13078 drivers/net/wireless/intel/iwlegacy/4965-mac.o
> decrease of 48

More likely different CONFIG options.

e.g. allyesconfig vs defconfig with wireless