x86: convert cpuinfo_x86 array to a per_cpu array

cpu_data is currently an array defined using NR_CPUS.  This means that
we overallocate since we will rarely really use maximum configured cpus.
When NR_CPU count is raised to 4096 the size of cpu_data becomes
3,145,728 bytes.

These changes were adopted from the sparc64 (and ia64) code.  An
additional field was added to cpuinfo_x86 to be a non-ambiguous cpu
index.  This corresponds to the index into a cpumask_t as well as the
per_cpu index.  It's used in various places like show_cpuinfo().

cpu_data is defined to be the boot_cpu_data structure for the NON-SMP
case.

Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Mark M. Hoffman <mhoffman@lightlink.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index 2d39f55d29a8..10b67170b133 100644
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -29,7 +29,7 @@
 void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
                                         unsigned int cpu)
 {
-        struct cpuinfo_x86 *c = cpu_data + cpu;
+        struct cpuinfo_x86 *c = &cpu_data(cpu);
 
         flags->bm_check = 0;
         if (num_online_cpus() == 1)
@@ -72,7 +72,7 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu,
                 struct acpi_processor_cx *cx, struct acpi_power_register *reg)
 {
         struct cstate_entry *percpu_entry;
-        struct cpuinfo_x86 *c = cpu_data + cpu;
+        struct cpuinfo_x86 *c = &cpu_data(cpu);
 
         cpumask_t saved_mask;
         int retval;