Message-ID: <4A575202.40407@zytor.com>
Date: Fri, 10 Jul 2009 07:36:50 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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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,
       Jon Masters <jonathan@jonmasters.org>,
       Thomas Gleixner <tglx@linutronix.de>, linux-arch@vger.kernel.org,
       linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org
Subject: Re: [PATCH] reduce export symbol CRC table size on 64-bit	 archs
References: <4A4A18780200007800008345@vpn.id2.novell.com> <4A4E671C.2090201@suse.cz> <4A51C71B0200007800008EE2@vpn.id2.novell.com> <200907092044.22108.rusty@rustcorp.com.au> <4A57089B0200007800009C0E@vpn.id2.novell.com>
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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.
> 

If we're changing module-init-tools, it seems changing the section name
would be cleaner anyway.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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