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

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Message-ID: <4A5AEC3C.2060608@suse.cz>
Date:	Mon, 13 Jul 2009 10:11:40 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Ingo Molnar <mingo@...e.hu>,
	tony.luck@...el.com, Jon Masters <jonathan@...masters.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	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

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.

Michal
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