linux-kernel - Re: [PATCH] sched/s390: fix compile error in sched/core.c

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Date:	Wed, 11 Jan 2012 10:07:48 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/s390: fix compile error in sched/core.c

On Wed, 2012-01-11 at 08:58 +0100, Christian Borntraeger wrote:
> From: Christian Borntraeger <borntraeger@...ibm.com>
> 
> commit 029632fbb7b7c9d85063cc9eb470de6c54873df3
>     sched: Make separate sched*.c translation units
> 
> removed the include of asm/mutex.h from sched.c. This breaks the combination of
> 
> CONFIG_MUTEX_SPIN_ON_OWNER=yes
> CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX=yes
> like s390 without mutex debugging:
> 
>   CC      kernel/sched/core.o
> kernel/sched/core.c: In function ‘mutex_spin_on_owner’:
> kernel/sched/core.c:3287: error: implicit declaration of function ‘arch_mutex_cpu_relax’
> make[2]: *** [kernel/sched/core.o] Error 1
> 
> Lets re-add the include to kernel/sched/core.c

Weird, I would have expected -next to pick this up.. Anyway, no
objection although do we really need that extra #ifdef ?

> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
>  kernel/sched/core.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index cecbb64..f82efdc 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -74,6 +74,9 @@
>  
>  #include <asm/tlb.h>
>  #include <asm/irq_regs.h>
> +#ifdef CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX
> +#include <asm/mutex.h>
> +#endif
>  #ifdef CONFIG_PARAVIRT
>  #include <asm/paravirt.h>
>  #endif

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