From: Dave Jones <davej@redhat.com>
To: ak@suse.de
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Make SMP x86-64 kernels boot on more UP systems.
Date: Thu, 23 Feb 2006 20:41:12 -0500 [thread overview]
Message-ID: <20060224014112.GA16089@redhat.com> (raw)
Should someone boot an SMP kernel on UP hardware on some systems,
strange things happen, such as..
SMP: Allowing 0 CPUs.
We blow up shortly afterwards.
Signed-off-by: Dave Jones <davej@redhat.com>
--- linux-2.6.15.noarch/arch/x86_64/kernel/smpboot.c~ 2006-02-20 21:59:56.000000000 -0500
+++ linux-2.6.15.noarch/arch/x86_64/kernel/smpboot.c 2006-02-20 22:01:57.000000000 -0500
@@ -975,6 +975,11 @@ __init void prefill_possible_map(void)
if (possible > NR_CPUS)
possible = NR_CPUS;
+ if (possible == 0) { /* Could be SMP kernel on UP hw with broken BIOS */
+ possible = 1;
+ printk (KERN_DEBUG "BIOS never enumerated boot CPU, fixing.\n");
+ }
+
printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
possible,
max_t(int, possible - num_processors, 0));
next reply other threads:[~2006-02-24 1:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-24 1:41 Dave Jones [this message]
2006-02-24 1:45 ` Make SMP x86-64 kernels boot on more UP systems Andi Kleen
2006-02-24 2:11 ` Dave Jones
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