linux-kernel - Re: [PATCH 13/26] locking: Add non-fatal spin lock assert

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Message-ID: <20140903092723.GA4783@worktop.ger.corp.intel.com>
Date:	Wed, 3 Sep 2014 11:27:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 13/26] locking: Add non-fatal spin lock assert

On Tue, Sep 02, 2014 at 05:39:22PM -0400, Peter Hurley wrote:
> Provide method for non-essential or non-critical code to warn of
> invariant errors.
> 
> CC: Ingo Molnar <mingo@...nel.org>
> CC: Peter Zijlstra <peterz@...radead.org>
> CC: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Peter Hurley <peter@...leysoftware.com>
> ---
>  include/linux/spinlock.h         | 1 +
>  include/linux/spinlock_api_smp.h | 1 +
>  include/linux/spinlock_api_up.h  | 1 +
>  3 files changed, 3 insertions(+)
> 
> diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
> index 3f2867f..8a9aaf1 100644
> --- a/include/linux/spinlock.h
> +++ b/include/linux/spinlock.h
> @@ -394,6 +394,7 @@ static inline int spin_can_lock(spinlock_t *lock)
>  }
>  
>  #define assert_spin_locked(lock)	assert_raw_spin_locked(&(lock)->rlock)
> +#define warn_not_spin_locked(lock)	warn_not_raw_spin_locked(&(lock)->rlock)
>  
>  /*
>   * Pull the atomic_t declaration:
> diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_smp.h
> index 42dfab8..0ddd499 100644
> --- a/include/linux/spinlock_api_smp.h
> +++ b/include/linux/spinlock_api_smp.h
> @@ -18,6 +18,7 @@
>  int in_lock_functions(unsigned long addr);
>  
>  #define assert_raw_spin_locked(x)	BUG_ON(!raw_spin_is_locked(x))
> +#define warn_not_raw_spin_locked(x)	WARN_ON_ONCE(!raw_spin_is_locked(x))

No we should remove assert_spin_locked() not add to it. Use
lockdep_assert_held() instead.
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