linux-kernel - Re: [patch] CFS scheduler, -v17

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Date:	Fri, 15 Jun 2007 19:47:14 +0200
From:	Miguel Botón <mboton@...il.com>
To:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [patch] CFS scheduler, -v17

On Friday 15 June 2007 18:28, Luiz Fernando N. Capitulino wrote:
>  Hmm, I'm getting this while compiling:
>
> """
>   LD      .tmp_vmlinux1
> kernel/built-in.o: In function `rq_clock':
> /home/lcapitulino/src/kernels/upstream/linux-2.6-cfs/kernel/sched.c:321:
> undefined reference to `cpu_of'
> /home/lcapitulino/src/kernels/upstream/linux-2.6-cfs/kernel/sched.c:321:
> undefined reference to `cpu_of'
> /home/lcapitulino/src/kernels/upstream/linux-2.6-cfs/kernel/sched.c:321:
> undefined reference to `cpu_of'
> /home/lcapitulino/src/kernels/upstream/linux-2.6-cfs/kernel/sched.c:321:
> undefined reference to `cpu_of'
> /home/lcapitulino/src/kernels/upstream/linux-2.6-cfs/kernel/sched.c:321:
> undefined reference to `cpu_of'
> kernel/built-in.o:/home/lcapitulino/src/kernels/upstream/linux-2.6-cfs/kern
>el/sched.c:321: more undefined references to `cpu_of' follow make: ***
> [.tmp_vmlinux1] Error 1
> """
>
>  The code in question is really strange:
>
> #ifdef CONFIG_SMP
> ...
> static inline int cpu_of(struct rq *rq)
> #ifdef CONFIG_SMP
> 	return rq->cpu;
> #else
> 	return 0;
> #endif
> }
> ...
> #endif

I patched kernel 2.6.21.5 with CFS v17 and I didn't experience this problem (I 
checked that piece of code and I didn't see something wrong).
Looks like it only appears in kernel 2.6.22-rc4.

-- 
	Miguel Botón
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