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Commit b74548e7 authored Aug 11, 2008 by Yinghai Lu Committed by Ingo Molnar Aug 11, 2008

x86: fix 2.6.27rc1 cannot boot more than 8CPUs



Jeff Chua reported that booting a !bigsmp kernel on a 16-way box
hangs silently.

this is a long-standing issue, smp start AP cpu could check the
apic id >=8 etc before trying to start it.

achieve this by moving the def_to_bigsmp check later and skip the
apicid id > 8

[ mingo@elte.hu: clean up the message that is printed. ]

Reported-by: "Jeff Chua" <jeff.chua.linux@gmail.com>
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

 arch/x86/kernel/setup.c   |    6 ------
 arch/x86/kernel/smpboot.c |   10 ++++++++++
 2 files changed, 10 insertions(+), 6 deletions(-)

parent 48d97cb6

arch/x86/kernel/setup.c

+0 −6

Original line number	Diff line number	Diff line
		@@ -861,12 +861,6 @@ void __init setup_arch(char **cmdline_p)
		init_apic_mappings();
		ioapic_init_mappings();

		#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC) && defined(CONFIG_X86_32)
		if (def_to_bigsmp)
		printk(KERN_WARNING "More than 8 CPUs detected and "
		"CONFIG_X86_PC cannot handle it.\nUse "
		"CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
		#endif
		kvm_guest_init();

		e820_reserve_resources();

arch/x86/kernel/smpboot.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -994,7 +994,17 @@ int __cpuinit native_cpu_up(unsigned int cpu)
		flush_tlb_all();
		low_mappings = 1;

		#ifdef CONFIG_X86_PC
		if (def_to_bigsmp && apicid > 8) {
		printk(KERN_WARNING
		"More than 8 CPUs detected - skipping them.\n"
		"Use CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP.\n");
		err = -1;
		} else
		err = do_boot_cpu(apicid, cpu);
		#else
		err = do_boot_cpu(apicid, cpu);
		#endif

		zap_low_mappings();
		low_mappings = 0;