linux-kernel - Re: [PATCH] usb-storage: Use const to reduce object data size

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Date:   Fri, 14 Feb 2020 17:01:11 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Joe Perches <joe@...ches.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>,
        <usb-storage@...ts.one-eyed-alien.net>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb-storage: Use const to reduce object data size

On Fri, 14 Feb 2020, Joe Perches wrote:

> Make structs const to reduce data size ~20KB.
> 
> Change function arguments and prototypes as necessary to compile.
> 
> $ size (x86-64 defconfig pre)
>    text	   data	    bss	    dec	    hex	filename
>   12281	  10948	    480	  23709	   5c9d	./drivers/usb/storage/usb.o
>     111	  10528	      8	  10647	   2997	./drivers/usb/storage/usual-tables.o
> 
> $ size (x86-64 defconfig post)
>    text	   data	    bss	    dec	    hex	filename
>   22809	    420	    480	  23709	   5c9d	drivers/usb/storage/usb.o
>   10551	      0	      0	  10551	   2937	drivers/usb/storage/usual-tables.o
> 
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
> 
> compile tested only
> 
>  drivers/usb/storage/usb.c          | 10 +++++-----
>  drivers/usb/storage/usb.h          |  5 +++--
>  drivers/usb/storage/usual-tables.c |  6 +++---
>  include/linux/usb_usual.h          |  2 +-
>  4 files changed, 12 insertions(+), 11 deletions(-)

It all looks quite reasonable.

Acked-by: Alan Stern <stern@...land.harvard.edu>

Alan Stern