linux-kernel - Re: [PATCH] basic perf support for sparc

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Date:	Mon, 3 Aug 2009 23:33:32 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Kyle McMartin <kyle@...artin.ca>, Ingo Molnar <mingo@...e.hu>,
	Jens Axboe <jens.axboe@...cle.com>,
	Anton Blanchard <anton@...ba.org>, davem@...emloft.net,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	fweisbec@...il.com, benh@...nel.crashing.org,
	penberg@...helsinki.fi, vegard.nossum@...il.com, paulus@...ba.org,
	williams@...hat.com
Subject: Re: [PATCH] basic perf support for sparc

On Sun, Aug 02, 2009 at 10:54:30PM -0300, Arnaldo Carvalho de Melo wrote:
> The problem is that at least on f11, libbfd.so is a... linker script,
> not an ELF shared library as the name seemed to imply.
> 

Ugh, that's weird. My fedora boxes are the same, but it's correctly a
symlink on my Debian box.
lrwxrwxrwx 1 root root     26 Aug  3 23:30 /usr/lib/libbfd.so ->
libbfd-2.19.51.20090723.so

Kind of strange it's a reference to bfd.a too. :/

> But if I cheat and do a dlopen on the full name, that includes the
> version, it works. Argh, I don't know why this has to be so contorted,
> does anybody here understands this?
> 
> Anyway, the reworked patch below works and additionally doesn't dlopens
> at each DSO, but just once and only if it finds a symbol starting with
> an underscore, an heuristic to avoid loading bfd if we don't need it.
> 

Looks better than mine. :)

cheers, Kyle
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