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From: Mikael Pettersson <mikpe@user.it.uu.se>
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Message-ID: <15965.59765.899035.587763@gargle.gargle.HOWL>
Date: Thu, 27 Feb 2003 11:33:25 +0100
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: Linus Torvalds <torvalds@transmeta.com>, Ion Badulescu <ionut@badula.org>,
       Rusty Russell <rusty@rustcorp.com.au>, linux-kernel@vger.kernel.org,
       mingo@redhat.com
Subject: Re: [BUG] 2.5.63: ESR killed my box!
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	<10510000.1046306748@[10.10.2.4]>
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Martin J. Bligh writes:
 > maybe change this bit in trap_init:
 > 
 > @@ -665,7 +665,6 @@
 >  	}
 >  	set_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
 >  	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 > -	boot_cpu_physical_apicid = 0;
 >  	if (nmi_watchdog != NMI_NONE)
 >  		nmi_watchdog = NMI_LOCAL_APIC;
 >  
 > to do:
 > 
 > boot_cpu_physical_apicid = hard_smp_processor_id();
 > phys_cpu_present_map = 1 << boot_cpu_physical_apicid;

I assume you meant detect_init_APIC().
No, you can't do any apic reads (which is what hard_smp_processor_id() does)
at this point since the local APIC isn't mapped yet. That happens shortly
after this, in init_apic_mappings()' set_fixmap_nocache() call.

/Mikael
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