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

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Message-ID: <1287071960.29097.284.camel@twins>
Date:	Thu, 14 Oct 2010 17:59:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	gerald.schaefer@...ibm.com
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 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?
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