linux-kernel - Re: [PATCH] reduce export symbol CRC table size on 64-bit archs

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Message-Id: <1247567372.31188.229.camel@perihelion.bos.jonmasters.org>
Date:	Tue, 14 Jul 2009 06:29:32 -0400
From:	Jon Masters <jonathan@...masters.org>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	Michal Marek <mmarek@...e.cz>, Ingo Molnar <mingo@...e.hu>,
	tony.luck@...el.com, Thomas Gleixner <tglx@...utronix.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-modules@...r.kernel.org, hpa@...or.com
Subject: Re: [PATCH] reduce export symbol CRC table size on 64-bit	 archs

On Mon, 2009-07-13 at 09:44 +0100, Jan Beulich wrote:
> >>> Michal Marek <mmarek@...e.cz> 13.07.09 10:11 >>>
> >Jan Beulich napsal(a):
> >> Actually I meanwhile think that module-init-tools can easily detect the changed
> >> layout without any further kernel side adjustments: Since it is known that a
> >> CRC always is a 32-bit value, simply checking whether the so-far-used 64-bit
> >> value has more than 32 significant bits should suffice: If so, the new layout
> >> is being used (with the symbol name starting at offset 4), else the old one is
> >> in effect (name at offset 8). This ought to be a pretty trivial change to that
> >> code.
> >
> >But old module-init-tools will continue reading garbage in this case.

Most of the distros can fix that with a dependency on the kernel package
in the absolute worst case, not that I love that idea, but it happens. I
assume for now we are going with detecting the two possibilities because
it doesn't really hurt in any case to have this support.

Jon.


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