linux-kernel - Re: [PATCH] staging: wfx: make a const array static, makes object smaller

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Date:   Mon, 19 Oct 2020 19:52:09 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Joe Perches <joe@...ches.com>,
        Colin King <colin.king@...onical.com>,
        Jérôme Pouiller <jerome.pouiller@...abs.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: wfx: make a const array static, makes object
 smaller

Le 17/10/2020 à 02:11, Joe Perches a écrit :
> On Fri, 2020-10-16 at 23:33 +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> Don't populate const array filter_ies on the stack but instead
>> make it static. Makes the object code smaller by 261 bytes.
>>
>> Before:
>>     text	   data	    bss	    dec	    hex	filename
>>    21674	   3166	    448	  25288	   62c8	drivers/staging/wfx/sta.o
>>
>> After:
>>     text	   data	    bss	    dec	    hex	filename
>>    21349	   3230	    448	  25027	   61c3	drivers/staging/wfx/sta.o
> 
> Thanks.
> 
> It's odd to me it's so large a change as it's only
> 24 bytes of initialization. (3 entries, each 8 bytes)
> 

The function looks small.
Maybe it is inlined by gcc in each of the 3 callers?

CJ

> This line in the same function:
> 
> 		hif_set_beacon_filter_table(wvif, 3, filter_ies);
> 
> might as well use ARRAY_SIZE(filter_ies) instead of 3
> 
> 
>