linux-kernel - Re: [RFC] mmiotrace full patch, preview 1

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Date:	Tue, 26 Feb 2008 15:20:57 +0000
From:	Andy Whitcroft <apw@...dowen.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Paalanen <pq@....fi>, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Pavel Roskin <proski@....org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC] mmiotrace full patch, preview 1

On Tue, Feb 26, 2008 at 11:49:48AM +0100, Ingo Molnar wrote:
> 
> * Andy Whitcroft <apw@...dowen.org> wrote:
> 
> > Ok, so that would be the following, work for everyone?
> > 
> > WARNING: mutexes are preferred for single holder semaphores
> > #1: FILE: Z95.c:1:
> > +       DECLARE_MUTEX(&foo);
> > 
> > WARNING: mutexes are preferred for single holder semaphores
> > #3: FILE: Z95.c:3:
> > +       init_MUTEX(&foo);
> 
> yeah.
> 
>   Acked-by: Ingo Molnar <mingo@...e.hu>
> 
> also i guess init_MUTEX_LOCKED() should emit a "this should be a 
> completion" warning.

Thats easy enough.  Though your tone here implies its less definatly
wrong than the other use forms.  Do we want gentle language here?

	"consider using a completion"

> i guess non-DEFINE_SPINLOCK old-style spinlock definition:
> 
>   spinlock_t lock = SPIN_LOCK_UNLOCKED;
> 
> should emit a 'use DEFINE_SPINLOCK' warning as well?

Those (SPIN_LOCK_UNLOCKED & RW_LOCK_UNLOCKED) we already pick up and
indicate are deprecated.

-apw
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