linux-kernel - Re: [PATCH v2] uas: replace WARN_ON_ONCE() with lockdep_assert

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Date:	Mon, 11 Aug 2014 23:31:26 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Sanjeev Sharma <sanjeev_sharma@...tor.com>, hdegoede@...hat.com,
	kraxel@...hat.com, mdharm-usb@...-eyed-alien.net,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH v2] uas: replace WARN_ON_ONCE() with lockdep_assert_held()

On Tue, Aug 12, 2014 at 02:01:53PM +0800, Greg KH wrote:
> On Tue, Aug 12, 2014 at 11:38:37AM +0530, Sanjeev Sharma wrote:
> > spin_is_locked() always return false in uniprocessor configuration and therefore it
> > would be advise to replace with lockdep_assert_held().
> 
> Add "on some architectures" in here somewhere, as it's not broken on the
> large majority of UP cpus :)
> 
FWIW, it is confirmed broken on mips (32 and 64 bit), ppc, and sparc64.
I have not tested on x86. Might be worth trying. arm64 seems to be ok,
unless I did something wrong in my test, as well as at least some of
the architectures which don't support smp to start with (such as sparc32
or microblaze).

Guenter
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