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

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Message-ID: <20140903144029.GA7083@twins.programming.kicks-ass.net>
Date:	Wed, 3 Sep 2014 16:40:29 +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 Wed, Sep 03, 2014 at 07:20:04AM -0400, Peter Hurley wrote:
> Hi Peter,
> 
> On 09/03/2014 05:27 AM, Peter Zijlstra wrote:
> > 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.
> 
> I probably should have been more descriptive in the changelog: this
> is not for a test configuration, but rather, an assertion in an
> exported api.

So ?
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