linux-kernel - Re: [PATCH][next] ptp_qoriq: don't pass a large struct by value but instead pass it by reference

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Message-Id: <20190219.141557.284906726764572414.davem@davemloft.net>
Date:   Tue, 19 Feb 2019 14:15:57 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     yangbo.lu@....com, claudiu.manoil@....com,
        richardcochran@...il.com, leoyang.li@....com,
        netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] ptp_qoriq: don't pass a large struct by value
 but instead pass it by reference

From: Colin King <colin.king@...onical.com>
Date: Tue, 19 Feb 2019 14:21:20 +0000

> From: Colin Ian King <colin.king@...onical.com>
> 
> Passing the struct ptp_clock_info caps by parameter is passing over 130 bytes
> of data by value on the stack. Optimize this by passing it by reference instead.
> Also shinks the object code size:
> 
> Before:
>    text	   data	    bss	    dec	    hex	filename
>   12596	   2160	     64	  14820	   39e4	drivers/ptp/ptp_qoriq.o
> 
> After:
>    text	   data	    bss	    dec	    hex	filename
>   12567	   2160	     64	  14791	   39c7	drivers/ptp/ptp_qoriq.o
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Looks good, applied, thanks.