Messages in this thread Patch in this message | | | Date | Thu, 23 Feb 2006 20:41:12 -0500 | From | Dave Jones <> | Subject | Make SMP x86-64 kernels boot on more UP systems. |
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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)); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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