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Message-id: <1263611228-6751-38-git-send-email-yinghai@kernel.org>
Date: Fri, 15 Jan 2010 19:07:08 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
Christoph Lameter <cl@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
Yinghai Lu <yinghai@...nel.org>
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 <yinghai@...nel.org>
---
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;
else
possible = setup_possible_cpus;
--
1.6.4.2
--
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