linux-kernel - Re: [PATCH] mutex: make mutex_lock

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Message-ID: <20151014082050.GQ17308@twins.programming.kicks-ass.net>
Date:	Wed, 14 Oct 2015 10:20:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>, akpm@...ux-foundation.org
Subject: Re: [PATCH] mutex: make mutex_lock_nested an inline function

> > On Tue, Oct 13, 2015 at 10:30:08PM +0200, Arnd Bergmann wrote:
> > > The second argument of the mutex_lock_nested() helper is only
> > > evaluated if CONFIG_DEBUG_LOCK_ALLOC is set. Otherwise we
> > > get this build warning for the new regulator_lock_supply
> > > function:
> > > 
> > > drivers/regulator/core.c: In function 'regulator_lock_supply':
> > > drivers/regulator/core.c:142:6: warning: unused variable 'i' [-Wunused-variable]
> > > 
> > > To avoid the warning, this patch changes the definition of
> > > mutex_lock_nested() to be static inline function rather than
> > > a macro, which tells gcc that the variable is potentially
> > > used.

Uuh, I just looked at next and saw this regulator_lock_supply()
function. How is that limited? subclass must be <8 otherwise bad things
happen.
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