linux-kernel - Re: mod_devicetable: Make dmi

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Message-ID: <87twv7c7p4.fsf@rustcorp.com.au>
Date:	Thu, 21 May 2015 06:01:03 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Michal Marek <mmarek@...e.cz>, Joe Perches <joe@...ches.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Quentin Casasnovas <quentin.casasnovas@...cle.com>,
	Andreas Schwab <schwab@...ux-m68k.org>
Subject: Re: mod_devicetable: Make dmi_strmatch.substr const char *

Michal Marek <mmarek@...e.cz> writes:
> Dne 20.5.2015 v 13:19 Rusty Russell napsal(a):
>> Joe Perches <joe@...ches.com> writes:
>>> On Tue, 2015-05-19 at 16:56 +0100, One Thousand Gnomes wrote:
>>>> On Tue, 19 May 2015 07:46:58 +0100 David Woodhouse <dwmw2@...radead.org> wrote:
>>>>> On Mon, 2015-05-18 at 17:07 -0700, Joe Perches wrote:
>>>>>> changed dmi_strmatch.substr from char * to char[79];
>>>>>>
>>>>>> Changing it back to const char * would shrink an x86-64
>>>>>> defconfig more than 100KB.
>
> As David already pointed out, this breaks modpost. Also, what makes
> the dmi tables special? We use character arrays in other tables as
> well, to make them self-contained for modpost.

Yes, but the patch I referred to merely shrunk it, or changed
it to a pointer in the !CONFIG_MODULES case.

modpost has gotten far more sophisticated, thanks mainly to the
init section detection code.  So it now knows about relocations;
it would be possible to use the same infrastructure to decode
char *, and I think it might be worth it.

It'd be a nice trick if someone were to code it :)

>> But it seems the file2alias code was rewritten in 2013 by Andreas Schwab
>> <schwab@...ux-m68k.org>, and SOB Michal Marek <mmarek@...e.cz>, without
>> going through me.  Annoying, since they had to hack it because people
>> screwed up mod_devicetable.h with arch-dependent layouts :(
>
> Oh, sorry about it.
>
>> I guess that means Michal is the maintainer now, so I've CC'd him.
>
> OK, fine, I can carry modpost patches in kbuid.git. I think I have
> merged a few more besides the file2alias rework.

Sure, let's do that from now on; I was a bit surprised but I'm always
happy for others to do my work for me :)

Thanks,
Rusty.
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