linux-kernel - Re: [PATCH] mutex: Introduce mutex_cpu

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Message-ID: <1287077465.8344.47.camel@thinkpad>
Date:	Thu, 14 Oct 2010 19:31:05 +0200
From:	Gerald Schaefer <gerald.schaefer@...ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH] mutex: Introduce mutex_cpu_relax()

On Do, 2010-10-14 at 17:59 +0200, Peter Zijlstra wrote:
> On Thu, 2010-10-14 at 17:33 +0200, Gerald Schaefer wrote:
> 
> > --- a/arch/s390/Kconfig
> > +++ b/arch/s390/Kconfig
> > @@ -100,6 +100,7 @@ config S390
> >  	select HAVE_KERNEL_BZIP2
> >  	select HAVE_KERNEL_LZMA
> >  	select HAVE_KERNEL_LZO
> > +	select HAVE_MUTEX_CPU_RELAX
> >  	select ARCH_INLINE_SPIN_TRYLOCK
> >  	select ARCH_INLINE_SPIN_TRYLOCK_BH
> >  	select ARCH_INLINE_SPIN_LOCK
> 
> >  
> > +#ifndef HAVE_MUTEX_CPU_RELAX
> > +#define mutex_cpu_relax()	cpu_relax()
> > +#endif
> 
> Won't KConfig make CONFIG_HAVE_MUTEX_CPU_RELAX from that?
> 
> Also, don't you have to first create a dummy Kconfig variable before you
> select it?

Of course you're right. I first used a #define in a header file,
but decided to rather use the Kconfig approach to avoid header
file dependency problems, should have been more careful with that.

I'll send a new patch.


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