linux-kernel - Re: drivers/usb/misc/emi*.c have the biggest data objects in the whole tree

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Date:	Thu, 27 Sep 2007 21:41:11 -0700
From:	Greg KH <greg@...ah.com>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	tapio.laxstrom@...ime.fi, linux-kernel@...r.kernel.org
Subject: Re: drivers/usb/misc/emi*.c have the biggest data objects in the
	whole tree

On Fri, Sep 14, 2007 at 11:35:34AM +0100, Denys Vlasenko wrote:
> Hi Tapio,
> 
> You are the author of these files. Are you still maintaining them?
> If not, do you know who is the current maintainer?
> 
> These two object files hold the biggest data objects in the whole Linux kernel
> after lockdep:
> 
>    text    data     bss     dec     hex filename
>    1258  160516       0  161774   277ee ./drivers/usb/misc/emi26.o
>    1504  209296       0  210800   33770 ./drivers/usb/misc/emi62.o
> 
> Basically, these are big arrays of the following structures:
> 
> typedef struct _INTEL_HEX_RECORD
> {
>         __u32   length;
>         __u32   address;
>         __u32   type;
>         __u8    data[MAX_INTEL_HEX_RECORD_LENGTH];
> } INTEL_HEX_RECORD;
> 
> I suggest the following optimizations:
> 
> Change structure to
> 
> typedef struct _INTEL_HEX_RECORD
> {
>         __u8   type;
>         __u8   length;
>         __u16   address;
>         __u8    data[MAX_INTEL_HEX_RECORD_LENGTH];
> } INTEL_HEX_RECORD __attribute__((__packed__));

Only if you redo the whole firmware image too :)

What is this really hurting?  It's only relevant if you load the
specific module, if you have this device type.  It's a firmware blob,
nothing really interesting at all.

thanks,

greg k-h
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