linux-kernel - Re: PREEMPT

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Message-ID: <20130807205357.GD11612@kmo-pixel>
Date:	Wed, 7 Aug 2013 13:53:57 -0700
From:	Kent Overstreet <kmo@...erainc.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: PREEMPT_RT vs bcache

On Wed, Aug 07, 2013 at 10:28:18PM +0200, Ben Hutchings wrote:
> As Kent said back in 2011 (commit 84759c6d18c5), bcache needs
> {down,up}_read_non_owner().  But these are not implemented by the -rt
> patchset when PREEMPT_RT_FULL is enabled.  Can they be added, or is
> there a fundamental conflict here?

You should be able to cherry pick
84759c6d18c5144432781ddca037d929ee9db8a5 (Revert "rw_semaphore: remove
up/down_read_non_owner") - that went in when bcache was merged.
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