x86, apic: Fix dummy apic read operation together with broken MP handling
Ingo Molnar reported that read_apic is buggy novadays: [ 0.000000] Using APIC driver default [ 0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs [ 0.000000] Local APIC disabled by BIOS -- you can enable it with "lapic" [ 0.000000] APIC: disable apic facility [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at arch/x86/kernel/apic/apic.c:254 native_apic_read_dummy+0x2d/0x3b() [ 0.000000] Hardware name: HP OmniBook PC Indeed we still rely on apic->read operation for SMP compiled kernel. And instead of disfigure the SMP code with #ifdef we allow to call apic->read. To capture any unexpected results we check for apic->read being called for sane reason via WARN_ON_ONCE but(!) instead of OR we should use AND logical operation (thanks Yinghai for spotting the root of the problem). Along with that we could be have bad MP table and we are to fix it that way no SMP started and no complains about BIOS bug if apic was just disabled via command line. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <20090607124840.GD4547@lenovo> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -249,7 +249,7 @@ static void native_apic_write_dummy(u32 reg, u32 v)
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static u32 native_apic_read_dummy(u32 reg)
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{
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WARN_ON_ONCE((cpu_has_apic || !disable_apic));
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WARN_ON_ONCE((cpu_has_apic && !disable_apic));
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return 0;
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}
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@ -1609,6 +1609,13 @@ void __init init_apic_mappings(void)
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new_apicid = read_apic_id();
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if (boot_cpu_physical_apicid != new_apicid) {
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boot_cpu_physical_apicid = new_apicid;
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/*
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* yeah -- we lie about apic_version
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* in case if apic was disabled via boot option
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* but it's not a problem for SMP compiled kernel
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* since smp_sanity_check is prepared for such a case
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* and disable smp mode
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*/
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apic_version[new_apicid] =
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GET_APIC_VERSION(apic_read(APIC_LVR));
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}
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@ -992,10 +992,12 @@ static int __init smp_sanity_check(unsigned max_cpus)
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*/
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if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) &&
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!cpu_has_apic) {
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printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
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if (!disable_apic) {
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pr_err("BIOS bug, local APIC #%d not detected!...\n",
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boot_cpu_physical_apicid);
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printk(KERN_ERR "... forcing use of dummy APIC emulation."
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pr_err("... forcing use of dummy APIC emulation."
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"(tell your hw vendor)\n");
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}
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smpboot_clear_io_apic();
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arch_disable_smp_support();
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return -1;
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