linux-kernel - Re: [PATCH 2/2] mutex: use spin_[un]lock instead of arch_spin

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Message-ID: <20130129092849.GA6665@gmail.com>
Date:	Tue, 29 Jan 2013 10:28:49 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	nan chen <nachenn@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 2/2] mutex: use spin_[un]lock instead of
 arch_spin_[un]lock


* nan chen <nachenn@...il.com> wrote:

> > #define spin_lock_mutex(lock, flags)                    \
> >         do {                                            \
> >                 struct mutex *l = container_of(lock, struct mutex,
> > wait_lock); \
> >                                                         \
> >                 DEBUG_LOCKS_WARN_ON(in_interrupt());    \
> >                 local_irq_save(flags);                  \
> >                 arch_spin_lock(&(lock)->rlock.raw_lock);\
> >                 DEBUG_LOCKS_WARN_ON(l->magic != l);     \
> >         } while (0)
> >
> > The original question was why mutex-debug.h (unmodified) uses
> > irq disabling.
> >
> > Thanks,
> >
> >         Ingo
> >
> 
> So, the reason why you use WARN_ON here is try to keep things 
> going?

What would be the alternative?

Thanks,

	Ingo
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