linux-kernel - [PATCH] sched: fix-local_cpu

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Date:	Mon, 24 Nov 2008 11:19:48 -0800
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Rusty Russell <rusty@...tcorp.com.au>, linux-kernel@...r.kernel.org
Subject: [PATCH] sched: fix-local_cpu_mask

Ingo Molnar wrote:
> plus there's a build failure as well on 32-bit:
> 
> kernel/sched_rt.c:1561: error: 'per_cpu__local_cpu_mask' undeclared (first use in this function)
> kernel/sched_rt.c:1561: error: (Each undeclared identifier is reported only once
> kernel/sched_rt.c:1561: error: for each function it appears in.)
> kernel/sched.c:8348: error: 'nohz' undeclared (first use in this function)
> kernel/sched.c:8350: error: 'cpu_isolated_map' undeclared (first use in this function)
> 
> with the attached config, caused by your patches. Please send delta 
> fixes against tip/cpus4096.
> 
> Thanks,
> 
> 	Ingo
> 
sched: fix-local_cpu_mask

This should fix the errors for the i386 non-smp case.  I've also
checked it against the 32/64 allnoconfigs and allyesconfigs.

Based on tip/cpus4096 @ v2.6.28-rc6-254-g96f874e

Signed-off-by: Mike Travis <travis@....com>
---
 kernel/sched.c    |    6 ++++--
 kernel/sched_rt.c |    4 +++-
 2 files changed, 7 insertions(+), 3 deletions(-)

--- linux-2.6.28-tip-cpumasks.orig/kernel/sched.c
+++ linux-2.6.28-tip-cpumasks/kernel/sched.c
@@ -8347,12 +8347,14 @@ void __init sched_init(void)
 	 */
 	current->sched_class = &fair_sched_class;
 
-	/* Allocate the nohz_cpu_mask if CONFIG_CPUMASK_OFFSTACK */
-	alloc_bootmem_cpumask_var(&nohz_cpu_mask);
+#ifdef CONFIG_SMP
 #ifdef CONFIG_NO_HZ
+	/* Allocate the nohz_cpu_mask if CONFIG_CPUMASK_OFFSTACK */
 	alloc_bootmem_cpumask_var(&nohz.cpu_mask);
 #endif
+	/* Allocate the cpu_isolated_map if CONFIG_CPUMASK_OFFSTACK */
 	alloc_bootmem_cpumask_var(&cpu_isolated_map);
+#endif
 
 	scheduler_running = 1;
 }
--- linux-2.6.28-tip-cpumasks.orig/kernel/sched_rt.c
+++ linux-2.6.28-tip-cpumasks/kernel/sched_rt.c
@@ -1552,7 +1552,8 @@ static void print_rt_stats(struct seq_fi
 }
 #endif /* CONFIG_SCHED_DEBUG */
 
-/* Note that this is never called for !SMP, but that's OK. */
+#ifdef CONFIG_SMP
+/* Note that this is never called for !SMP */
 static inline void init_sched_rt_class(void)
 {
 	unsigned int i;
@@ -1560,3 +1561,4 @@ static inline void init_sched_rt_class(v
 	for_each_possible_cpu(i)
 		alloc_cpumask_var(&per_cpu(local_cpu_mask, i), GFP_KERNEL);
 }
+#endif

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