linux-kernel - Re: [PATCH 09/11] liblockdep: support using LD

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Message-ID: <20130207102843.GG17781@cedar>
Date:	Thu, 7 Feb 2013 10:28:43 +0000
From:	Jamie Iles <jamie.iles@...cle.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	mingo@...nel.org, peterz@...radead.org, jamie.iles@...cle.com,
	penberg@...nel.org, acme@...stprotocols.net, paulus@...ba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/11] liblockdep: support using LD_PRELOAD

Hi Sasha,

On Wed, Feb 06, 2013 at 05:11:32PM -0500, Sasha Levin wrote:
> This allows lockdep to be used without being compiled in the original program.
> 
> Usage is quite simple:
> 
> 	LD_PRELOAD=/path/to/liblockdep.so /path/to/my/program
> 
> And magically, you'll have lockdep in your program!
> 
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> ---
> diff --git a/tools/lib/lockdep/preload.c b/tools/lib/lockdep/preload.c
> new file mode 100644
> index 0000000..0f71c23
> --- /dev/null
> +++ b/tools/lib/lockdep/preload.c
...
> +int pthread_rwlock_init(pthread_rwlock_t *rwlock,
> +			const pthread_rwlockattr_t *attr)
> +{
> +	if (ll_pthread_rwlock_init == NULL)
> +		init_preload();

Why is this one special, doesn't init_preload being a constructor make 
this redundant?

Jamie
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