Forward this to kexec mailing list. Hi HATAYAMA,
Since you are very familiar with boot_cpu_physical_apicid and its change related to kdump, could you help review this patch? Thanks Baoquan > Date: Tue, 15 Apr 2014 07:55:54 +0800 > From: Baoquan He <[email protected]> > To: [email protected] > Cc: [email protected], [email protected], [email protected], > [email protected], [email protected], Baoquan He <[email protected]> > Subject: [PATCH] acpi: try to trust cpu_index from x86_cpu_to_apicid > > In smp with multi cpus, when enter into kdump kernel with only 1 cpu, > a warning message is printed out: > > acpi LNXCPU:0a: BIOS reported wrong ACPI id 0 for the processor > > In this case kdump kernel use the same ACPI tables as 1st kernel, > means lapic information is got from MADT. The acpi_id related to > this cpu index and lapic_id may not be 0, so the code to assign > value to cpu_index is not correct in this case per cpu0_initialized. > cpu index stored in x86_cpu_to_apicid need be respected. > > Now fix it in this patch per boot_cpu_physical_apicid. When cpu index > related to boot_cpu_physical_apicid is not stored in x86_cpu_to_apicid, > then we can say this is UP system running SMP kernel with no LAPIC in MADT > > Signed-off-by: Baoquan He <[email protected]> > --- > drivers/acpi/acpi_processor.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c > index c29c2c3..1ae460c 100644 > --- a/drivers/acpi/acpi_processor.c > +++ b/drivers/acpi/acpi_processor.c > @@ -267,7 +267,7 @@ static int acpi_processor_get_info(struct acpi_device > *device) > pr->apic_id = apic_id; > > cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id); > - if (!cpu0_initialized) { > + if (!cpu0_initialized && (boot_cpu_physical_apicid == pr->apic_id)) { > cpu0_initialized = 1; > /* Handle UP system running SMP kernel, with no LAPIC in MADT */ > if ((cpu_index == -1) && (num_online_cpus() == 1)) > -- > 1.8.5.3 > ----- End forwarded message ----- _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
