[PATCH 2/3] cpumask: Put cpumask_of_cpu_map in the initdata section

[Mike Travis]

  * Create the cpumask_of_cpu_map statically in the init data section
    using NR_CPUS but replace it during boot up with one sized by
    nr_cpu_ids (num possible cpus).

Based on linux-2.6.tip/master.

Signed-off-by: Mike Travis <travis@xxxxxxx>
---
 arch/x86/kernel/setup_percpu.c |   10 ++++++----
 kernel/cpu.c                   |    8 +++++---
 2 files changed, 11 insertions(+), 7 deletions(-)

--- linux-2.6.tip.orig/arch/x86/kernel/setup_percpu.c
+++ linux-2.6.tip/arch/x86/kernel/setup_percpu.c
@@ -81,10 +81,12 @@ static void __init setup_per_cpu_maps(vo
 }
 
 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
-cpumask_t *cpumask_of_cpu_map __read_mostly;
-EXPORT_SYMBOL(cpumask_of_cpu_map);
-
-/* requires nr_cpu_ids to be initialized */
+/*
+ * Replace static cpumask_of_cpu_map in the initdata section,
+ * with one that's allocated sized by the possible number of cpus.
+ *
+ * (requires nr_cpu_ids to be initialized)
+ */
 static void __init setup_cpumask_of_cpu(void)
 {
 	int i;
--- linux-2.6.tip.orig/kernel/cpu.c
+++ linux-2.6.tip/kernel/cpu.c
@@ -457,7 +457,6 @@ out:
 
 #endif /* CONFIG_SMP */
 
-#ifndef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
 /* 64 bits of zeros, for initializers. */
 #if BITS_PER_LONG == 32
 #define Z64 0, 0
@@ -507,7 +506,11 @@ out:
 
 /* We want this statically initialized, just to be safe.  We try not
  * to waste too much space, either. */
-static const cpumask_t cpumask_map[] = {
+static const cpumask_t cpumask_map[]
+#ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
+__initdata
+#endif
+= {
 	CMI0(0), CMI0(1), CMI0(2), CMI0(3),
 #if NR_CPUS > 4
 	CMI0(4), CMI0(5), CMI0(6), CMI0(7),
@@ -567,4 +570,3 @@ static const cpumask_t cpumask_map[] = {
 };
 
 const cpumask_t *cpumask_of_cpu_map = cpumask_map;
-#endif /* !CONFIG_HAVE_CPUMASK_OF_CPU_MAP */

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