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

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Date:	Wed, 14 Oct 2015 11:00:20 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] mutex: make mutex_lock_nested an inline function

On Wednesday 14 October 2015 10:37:07 Peter Zijlstra wrote:
> On Wed, Oct 14, 2015 at 10:20:50AM +0200, Peter Zijlstra wrote:
> > > > 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.
> 
> Also, the function appears unused, just delete it 

That was my first suggestion as well when I ran into 

drivers/regulator/core.c:139:13: warning: 'regulator_lock_supply' defined but not used

but apparently this is work-in-progress and the plan is to use it
in 4.4 when the rest of the currently-under-review patches are merged.

	Arnd
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