linux-kernel - Re: [PATCH] OF: Fixup resursive locking code paths

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Message-ID: <alpine.LFD.2.02.1302041147420.11905@ionos>
Date:	Mon, 4 Feb 2013 11:48:24 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org
Subject: Re: [PATCH] OF: Fixup resursive locking code paths

On Fri, 25 Jan 2013, Paul Gortmaker wrote:

> From: Thomas Gleixner <tglx@...utronix.de>
> 
> There is no real reason to use a rwlock for devtree_lock. It even
> could be a mutex, but unfortunately it's locked from cpu hotplug
> paths which can't schedule :(
> 
> So it needs to become a raw lock on rt as well.  The devtree_lock would
> be the only user of a raw_rw_lock, so we are better off cleaning up the
> recursive locking paths which allows us to convert devtree_lock to a
> read_lock.

Hmm. It's already a rw_lock. For RT we want to change that thing to a
raw_spinlock.

Thanks,

	tglx
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