linux-kernel - [PATCH] x86: move prefill_possible

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Date:	Wed, 2 Jul 2008 18:54:40 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: move prefill_possible_map calling early


call it right after we done with MADT/mptable handling, instead of doing that
in setup_per_cpu_areas later...
so for_possible_cpu could be used early.

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

---
 arch/x86/kernel/setup.c        |    1 +
 arch/x86/kernel/setup_percpu.c |   10 ----------
 arch/x86/kernel/smpboot.c      |    8 ++++++++
 include/asm-x86/smp.h          |    4 ++++
 4 files changed, 13 insertions(+), 10 deletions(-)

Index: linux-2.6/arch/x86/kernel/setup.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup.c
+++ linux-2.6/arch/x86/kernel/setup.c
@@ -788,6 +788,7 @@ void __init setup_arch(char **cmdline_p)
 		get_smp_config();
 #endif
 
+	prefill_possible_map();
 #ifdef CONFIG_X86_64
 	init_cpu_to_node();
 #endif
Index: linux-2.6/arch/x86/kernel/setup_percpu.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_percpu.c
+++ linux-2.6/arch/x86/kernel/setup_percpu.c
@@ -162,16 +162,6 @@ void __init setup_per_cpu_areas(void)
 	char *ptr;
 	int cpu;
 
-	/* no processor from mptable or madt */
-	if (!num_processors)
-		num_processors = 1;
-
-#ifdef CONFIG_HOTPLUG_CPU
-	prefill_possible_map();
-#else
-	nr_cpu_ids = num_processors;
-#endif
-
 	/* Setup cpu_pda map */
 	setup_cpu_pda_map();
 
Index: linux-2.6/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/smpboot.c
+++ linux-2.6/arch/x86/kernel/smpboot.c
@@ -1278,12 +1278,20 @@ __init void prefill_possible_map(void)
 	int i;
 	int possible;
 
+	/* no processor from mptable or madt */
+	if (!num_processors)
+		num_processors = 1;
+
+#ifdef CONFIG_HOTPLUG_CPU
 	if (additional_cpus == -1) {
 		if (disabled_cpus > 0)
 			additional_cpus = disabled_cpus;
 		else
 			additional_cpus = 0;
 	}
+#else
+	additional_cpus = 0;
+#endif
 	possible = num_processors + additional_cpus;
 	if (possible > NR_CPUS)
 		possible = NR_CPUS;
Index: linux-2.6/include/asm-x86/smp.h
===================================================================
--- linux-2.6.orig/include/asm-x86/smp.h
+++ linux-2.6/include/asm-x86/smp.h
@@ -124,6 +124,10 @@ static inline int num_booting_cpus(void)
 {
 	return cpus_weight(cpu_callout_map);
 }
+#else
+static inline void prefill_possible_map(void)
+{
+}
 #endif /* CONFIG_SMP */
 
 extern unsigned disabled_cpus __cpuinitdata;
--
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