linux-kernel - Re: [PATCH v2] Btrfs, lockdep: get_restripe_target: use lockdep in BUG

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Date:	Fri, 6 Apr 2012 12:20:33 -0500
From:	Mitch Harder <mitch.harder@...ayonlinux.org>
To:	Ilya Dryomov <idryomov@...il.com>
Cc:	Bobby Powers <bobbypowers@...il.com>, linux-btrfs@...r.kernel.org,
	Chris Mason <chris.mason@...cle.com>,
	Andi Kleen <ak@...ux.intel.com>, Jeff Mahoney <jeffm@...e.de>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Btrfs, lockdep: get_restripe_target: use lockdep in BUG_ON

On Thu, Apr 5, 2012 at 11:51 AM, Ilya Dryomov <idryomov@...il.com> wrote:
> On Thu, Apr 05, 2012 at 12:23:01PM -0400, Bobby Powers wrote:
>> On Wed, Apr 4, 2012 at 10:04 PM, Bobby Powers <bobbypowers@...il.com> wrote:
>> > spin_is_locked always returns 0 on non-SMP systems, which causes btrfs
>> > to fail the mount.  There is documentation pending as to why checking
>>
>> I guess I should be explicit in stating that this is a regression, so
>> this patch or something else that addresses it should be pulled into
>> 3.4.
>
> Yes, this is a regression and spin_is_locked() definitely has to go.  I
> don't have a strong opinion on this assert, if there are objections to
> v2 I'm OK with ripping that BUG_ON entirely and replacing it with a
> comment (this function and its callers are WIP).
>

I'm still hitting this BUG_ON after applying this patch on my single
CPU AthlonXP x86 system.

I'm running a 3.3.1 kernel merged with the for-linus branch, and had
this patch applied.

I am currently testing with the BUG_ON commented out.  The btrfs
partitions mount without error, and I haven't encountered any
immediate issues.
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