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

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Date:   Fri, 16 Oct 2020 17:11:44 -0700
From:   Joe Perches <joe@...ches.com>
To:     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

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)

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