netdev - 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 09:23:16 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     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 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

julia

>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/net/wireless/intel/iwlegacy/4965-mac.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/intel/iwlegacy/4965-mac.c b/drivers/net/wireless/intel/iwlegacy/4965-mac.c
> index de9b6522c43f..65eba2c24292 100644
> --- a/drivers/net/wireless/intel/iwlegacy/4965-mac.c
> +++ b/drivers/net/wireless/intel/iwlegacy/4965-mac.c
> @@ -1480,7 +1480,7 @@ il4965_get_ac_from_tid(u16 tid)
>  static inline int
>  il4965_get_fifo_from_tid(u16 tid)
>  {
> -	const u8 ac_to_fifo[] = {
> +	static const u8 ac_to_fifo[] = {
>  		IL_TX_FIFO_VO,
>  		IL_TX_FIFO_VI,
>  		IL_TX_FIFO_BE,
> --
> 2.14.1
>
> --
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