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Message-ID: <20081216102340.GA1003@elte.hu>
Date: Tue, 16 Dec 2008 11:23:40 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Yinghai Lu <yhlu.kernel@...il.com>,
LKML <linux-kernel@...r.kernel.org>,
linux-next <linux-next@...r.kernel.org>
Subject: Re: [mmotm and linux-next][PATCH] irq: enclose irq_desc_lock_class
in CONFIG_LOCKDEP
* Ingo Molnar <mingo@...e.hu> wrote:
> > > #include "internals.h"
> > >
> > > +#ifdef CONFIG_LOCKDEP
> > > /*
> > > * lockdep: we want to handle all irq_desc locks as a single lock-class:
> > > */
> > > static struct lock_class_key irq_desc_lock_class;
> > > +#endif
> > >
> > > /**
> > > * handle_bad_irq - handle spurious and unhandled irqs
> > >
> >
> > No, lockdep.h (which we forgot to include) already handles that:
> >
> > # define lockdep_set_class(lock, key) do { (void)(key); } while (0)
> >
> > the problem is that the code which references irq_desc_lock_class is
> > inside #ifdef CONFIG_SPARSE_IRQ, so this is a better fix:
>
> agreed that this is the better fix - applied to tip/irq/sparseirq,
> thanks!
actually, this breaks the build on !SPARSEIRQ because we will use that
class in the non-sparseirq case. So we've converted a build warning to a
build failure ;-)
Ingo
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