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

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Message-ID: <4A575202.40407@zytor.com>
Date:	Fri, 10 Jul 2009 07:36:50 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Michal Marek <mmarek@...e.cz>, 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
Subject: Re: [PATCH] reduce export symbol CRC table size on 64-bit	 archs

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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