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Date:	Fri, 15 Jan 2010 19:07:08 -0800
From:	Yinghai Lu <>
To:	Ingo Molnar <>, Thomas Gleixner <>,
	"H. Peter Anvin" <>,
	Andrew Morton <>,
	Jesse Barnes <>,
	Christoph Lameter <>
	Yinghai Lu <>
Subject: [PATCH 37/37] x86: use num_processors for possible cpus

some systems that have disable cpus entries because same
  BIOS will support 2 sockets and 4 sockets and more at
  same time, BIOS just leave some disable entries, but
  those system do not support cpu hotplug. we don't need
  treat disabled_cpus as hotplug cpus.
so we can make nr_cpu_ids smaller and save more space
  (pcpu data allocations), and could make some systems run
  with logical flat instead of physical flat apic mode

-v2: change to black list instead
-v3: just remove that, and the one use possible_cpus= directly.

Signed-off-by: Yinghai Lu <>
 arch/x86/kernel/smpboot.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index f741c33..642440c 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1190,7 +1190,6 @@ early_param("possible_cpus", _setup_possible_cpus);
  * - Ashok Raj
  * Three ways to find out the number of additional hotplug CPUs:
- * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
  * - The user can overwrite it with possible_cpus=NUM
  * - Otherwise don't reserve additional CPUs.
  * We do this because additional CPUs waste a lot of memory.
@@ -1205,7 +1204,7 @@ __init void prefill_possible_map(void)
 		num_processors = 1;
 	if (setup_possible_cpus == -1)
-		possible = num_processors + disabled_cpus;
+		possible = num_processors;
 		possible = setup_possible_cpus;

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