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

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Date:	Fri, 15 Jun 2007 13:28:41 -0300
From:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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

Em Fri, 15 Jun 2007 00:49:08 +0200
Ingo Molnar <mingo@...e.hu> escreveu:

| 
| i'm pleased to announce release -v17 of the CFS scheduler patchset.
|  
| The rolled-up CFS patch against v2.6.22-rc4, v2.6.22-rc4-mm2, v2.6.21.5 
| or v2.6.20.13 can be downloaded from the usual place:
| 
|    http://people.redhat.com/mingo/cfs-scheduler/

 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/kernel/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

 Patch follows, only compile tested, hope it helps.

------

[PATCH]: Fix undefined reference to `cpu_of'
    
cpu_of() is defined inside a CONFIG_SMP #ifdef/#endif but called
by !CONFIG_SMP code.

This patch fixes that by creating a !CONFIG_SMP version of cpu_of().

Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@...driva.com.br>

diff --git a/kernel/sched.c b/kernel/sched.c
index abe6fab..be63f73 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -259,13 +259,9 @@ static inline u32 sg_div_cpu_power(const struct sched_group *sg, u32 load)
 	return reciprocal_divide(load, sg->reciprocal_cpu_power);
 }
 
-static inline int cpu_of(struct rq *rq)
+static inline int cpu_of(const struct rq *rq)
 {
-#ifdef CONFIG_SMP
 	return rq->cpu;
-#else
-	return 0;
-#endif
 }
 
 /*
@@ -277,7 +273,13 @@ static inline void sg_inc_cpu_power(struct sched_group *sg, u32 val)
 	sg->__cpu_power += val;
 	sg->reciprocal_cpu_power = reciprocal_value(sg->__cpu_power);
 }
-#endif
+#else /* !CONFIG_SMP */
+static inline int cpu_of(const struct rq *rq)
+{
+	return 0;
+}
+#endif /* CONFIG_SMP */
+
 /*
  * Per-runqueue clock, as finegrained as the platform can give us:
  */


-- 
Luiz Fernando N. Capitulino
-
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