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Ignore bogus ACPI info for offline CPUs
Booting a SMP kernel with maxcpus=1 on a SMP system leads to a hard hang, because ACPI ignores the maxcpus setting and sends timer broadcast info for the offline CPUs. This results in a stuck for ever call to smp_call_function_single() on an offline CPU. Ignore the bogus information and print a kernel error to remind ACPI folks to fix it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 12 additions and 5 deletions
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@ -243,11 +243,18 @@ void tick_broadcast_on_off(unsigned long reason, int *oncpu)
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{
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int cpu = get_cpu();
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if (cpu == *oncpu)
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tick_do_broadcast_on_off(&reason);
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else
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smp_call_function_single(*oncpu, tick_do_broadcast_on_off,
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&reason, 1, 1);
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if (!cpu_isset(*oncpu, cpu_online_map)) {
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printk(KERN_ERR "tick-braodcast: ignoring broadcast for "
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"offline CPU #%d\n", *oncpu);
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} else {
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if (cpu == *oncpu)
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tick_do_broadcast_on_off(&reason);
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else
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smp_call_function_single(*oncpu,
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tick_do_broadcast_on_off,
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&reason, 1, 1);
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}
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put_cpu();
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}
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