linux-kernel - RE: [PATCH] sgi-xp: Do not use BUG_ON(!spin_is

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Date:	Wed, 20 Aug 2014 05:24:19 +0000
From:	"Sharma, Sanjeev" <Sanjeev_Sharma@...tor.com>
To:	Ryan Mallon <rmallon@...il.com>, "cpw@....com" <cpw@....com>,
	"robinmholt@...il.com" <robinmholt@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] sgi-xp: Do not use BUG_ON(!spin_is_locked())

Opps ! Thanks for review comment. Just sent V2 updated patch.

Sanjeev Sharma

-----Original Message-----
From: Ryan Mallon [mailto:rmallon@...il.com] 
Sent: Wednesday, August 20, 2014 4:34 AM
To: Sharma, Sanjeev; cpw@....com; robinmholt@...il.com
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sgi-xp: Do not use BUG_ON(!spin_is_locked())

On 12/08/14 17:35, Sanjeev Sharma wrote:
> on some architecture spin_is_locked() always return false in 
> uniprocessor configuration and can therefore not be used with 
> BUG_ON.it would be advise to replace with lockdep_assert_held().
> 
> Signed-off-by: Sanjeev Sharma <Sanjeev_Sharma@...tor.com>
> ---
>  drivers/misc/sgi-xp/xpc_channel.c | 6 +++---
>  drivers/misc/sgi-xp/xpc_sn2.c     | 2 +-
>  drivers/misc/sgi-xp/xpc_uv.c      | 2 +-
>  3 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/misc/sgi-xp/xpc_channel.c 
> b/drivers/misc/sgi-xp/xpc_channel.c
> index 128d561..240fe5a 100644
> --- a/drivers/misc/sgi-xp/xpc_channel.c
> +++ b/drivers/misc/sgi-xp/xpc_channel.c
> @@ -28,7 +28,7 @@ xpc_process_connect(struct xpc_channel *ch, unsigned 
> long *irq_flags)  {
>  	enum xp_retval ret;
>  
> -	DBUG_ON(!spin_is_locked(&ch->lock));
> +	lockdep_assert_held(!spin_is_locked(&ch->lock));

This is incorrect, and will break the build with CONFIG_LOCKDEP enabled.
You actually want:

	lockdep_assert_held(&ch->lock);

Same for the other instances.

~Ryan
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