linux-kernel - Re: [PATCH v3 2/9] liblockdep: Wrap kernel/lockdep.c to allow usage from userspace

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Date:	Fri, 10 May 2013 11:38:48 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/9] liblockdep: Wrap kernel/lockdep.c to allow usage
 from userspace


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Thu, May 09, 2013 at 11:58:02AM -0400, Sasha Levin wrote:
> > kernel/lockdep.c deals with validating locking scenarios for
> > various architectures supported by the kernel. There isn't
> > anything kernel specific going on in lockdep, and when we
> > compare userspace to other architectures that don't have to deal
> > with irqs such as s390, they become all too similar.
> > 
> > We wrap kernel/lockdep.c and include/linux/lockdep.h with
> > several headers which allow us to build and use lockdep from
> > userspace. We don't touch the kernel code itself which means
> > that any work done on lockdep in the kernel will automatically
> > benefit userspace lockdep as well!
> > 
> > Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> > ---
> 
> OK, this patch is a complete fail with anything not git. Please fix it so I can
> use quilt.

The way I work that around is by making empty files a single-line empty 
file, with a single \n in them.

Thanks,

	Ingo
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