linux-kernel - Re: [RFC][PATCH RT] acpi/rt: Convert acpi lock back to a raw_spinlock

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Message-ID: <alpine.LFD.2.03.1302131844530.13701@tycho>
Date:	Wed, 13 Feb 2013 18:46:50 +0100 (CET)
From:	John Kacur <jkacur@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	John Kacur <jkacur@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	John Kacur <jkacur@...il.com>,
	Clark Williams <clark@...hat.com>
Subject: Re: [RFC][PATCH RT] acpi/rt: Convert acpi lock back to a
 raw_spinlock_t



On Wed, 13 Feb 2013, Thomas Gleixner wrote:

> On Wed, 13 Feb 2013, John Kacur wrote:
> > 
> > Thanks Steven. That looks way better than the previous revert.
> 
> I can't tell as I haven't seen the previous revert. And looks good is
> not really a good review criteria.

Absolutely true, and I wasn't claiming to have reviewed it, just wanted to 
let everyone know that testing on it was to begin.
> 
> The patch is converting _all_ the spin_locks in acpi to raw spinlocks,
> which will give you a nice bunch of "BUG: sleeping function called
> from invalid context" splats depending on the ACPI functionality of
> your machine.
> 
> The lock which is related to this splat is: acpi_gbl_hardware_lock and
> that's the only lock which can be safely converted to a raw spinlock.
> 
> Untested patch below.
> 
> Thanks,
> 
> 	tglx


Thank you Thomas, adding this version instead to our test queue.

John

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