linux-kernel - Re: [tip:x86/urgent] x86, apic: Map the local apic when parsing the MP table.

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Date:	Fri, 06 Aug 2010 17:51:52 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, tvrtko.ursulin@...hos.com,
	hilld@...arystorm.net, tglx@...utronix.de, hpa@...ux.intel.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86, apic: Map the local apic when parsing the
 MP table.

On 08/06/2010 05:15 PM, H. Peter Anvin wrote:
> On 08/06/2010 05:08 PM, Yinghai Lu wrote:
>> this change is not needed, it will break:
>> 1. found mptable, but is using default contruct path.
>> 2. visws path, found found mptable, but get_smp_conf is not called.
>>
>> YH
> 
> I'm not sure the above is decipherable.  Please provide an incremental
> patch with a more detailed description.
> 
please check

[PATCH] x86: Fix lapic mapping with construct ISA and visws mptable path

do need to set lapic mapping for them

in arch/x86/kernel/visws_quirks.c:
we only have visws_find_smp_config() to set mp_lapic_addr to APIC_DEFAULT_PHYS_BASE
visws_get_smp_config() is nop call.
default_get_smp_config/check_physptr/smp_read_mpc is not called in the path.
So smp_register_lapic_address() is not called, and lapic is not mapped.


in arch/x86/kernel/mpparse.c
if mpf->feature1 != 0, it will go through contruct_default_ISA_mptable instead
of check_phystr path, so smp_register_lapic_address is not called.

those two path all have smp_found_config set.

So let remove !smp_found_config checking

Actually set fixmap two times does not hurt.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/kernel/apic/apic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/arch/x86/kernel/apic/apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/apic.c
+++ linux-2.6/arch/x86/kernel/apic/apic.c
@@ -1606,7 +1606,7 @@ void __init init_apic_mappings(void)
 		 * acpi lapic path already maps that address in
 		 * acpi_register_lapic_address()
 		 */
-		if (!acpi_lapic && !smp_found_config)
+		if (!acpi_lapic)
 			set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
 
 		apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n",
--
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