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

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Message-Id: <200907011430.29524.rusty@rustcorp.com.au>
Date:	Wed, 1 Jul 2009 14:30:28 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Jan Beulich" <JBeulich@...ell.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, tony.luck@...el.com,
	"Thomas Gleixner" <tglx@...utronix.de>, hpa@...or.com,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] reduce export symbol CRC table size on 64-bit archs

On Tue, 30 Jun 2009 09:21:52 pm Jan Beulich wrote:
> Since these CRCs are really only 32-bit quantities, there's no need to
> store them in 64-bit slots. Since, however, gcc doesn't allow
> respective initializations, asm() constructs get used to create the CRC
> tables (and its for that reason that the patch only makes x86-64 and
> ia64 utilize that functionality, as I can't verify this doesn't break
> in some subtle way elsewhere).

Hmm, can we change the build system to just link this in as a normal table, 
rather than use linker tricks?

Then genksyms would just spit out a C file we could compile and link into final 
vmlinux.

Thanks,
Rusty.
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