Subject: Re: [PATCH] reduce export symbol CRC table size on 64-bit archs
From: Jon Masters <jonathan@jonmasters.org>
To: Jan Beulich <JBeulich@novell.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>, Michal Marek <mmarek@suse.cz>,
       Ingo Molnar <mingo@elte.hu>, tony.luck@intel.com,
       Thomas Gleixner <tglx@linutronix.de>, linux-arch@vger.kernel.org,
       linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org,
       hpa@zytor.com
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Organization: World Organi[sz]ation Of Broken Dreams
Date: Fri, 10 Jul 2009 11:50:01 -0400
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On Fri, 2009-07-10 at 08:23 +0100, Jan Beulich wrote:

> 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.

Agreed. That can be done. I won't get chance to do that until Sunday
though because I'm about to be on a plane back from Tokyo to Boston and
I expect a day of living hell with jetlag/email craziness.

Jon.


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