linux-kernel - Re: [PATCH 1/6] kbuild: Remove relocations from kallsyms table

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Message-ID: <20140218185007.GB22728@two.firstfloor.org>
Date:	Tue, 18 Feb 2014 19:50:08 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	sam@...nborg.org, x86@...nel.org, linux-kbuild@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/6] kbuild: Remove relocations from kallsyms table

On Tue, Feb 18, 2014 at 06:28:54AM -0800, H. Peter Anvin wrote:
> On 02/18/2014 06:24 AM, Andi Kleen wrote:
> > From: Andi Kleen <ak@...ux.intel.com>
> > 
> > Remove the ELF relocations from the kallsyms_address[] table.
> > Instead we just store offsets to _text and relocate that while
> > accessing the kallsyms table. This is done with a new
> > kallsyms_offsets[] table. With these changes .tmp_kallsyms*.o
> > becomes relocation free.
> > 
> > In theory this would also allow to shrink the kallsyms table
> > on 64bit by using offsets.
> > 
> 
> Why not do that, then?

I tried it once, but it didn't boot for some reason. Didn't have
time to track it down so I removed it. Could be done as followon
work.

-Andi
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