linux-kernel - Re: [PATCH 0/79] smpboot integration

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Date:	Wed, 19 Mar 2008 20:36:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Glauber de Oliveira Costa <gcosta@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	tglx@...utronix.de, ak@...e.de
Subject: Re: [PATCH 0/79] smpboot integration


* Ingo Molnar <mingo@...e.hu> wrote:

> the small fix below was needed - it is possible to build ACPI on 
> 32-bit with APIC support disabled. Otherwise it's looking good in my 
> testing.

another fix for a small (and rare) build bug i found is below: it is 
possible to build a kernel with CONFIG_X86_MPPARSE but without 
CONFIG_SMP. In that case x86_bios_cpu_apicid has to be provided, and the 
use of the early-apicids has to be inhibited.

	Ingo

---
 arch/x86/kernel/mpparse_32.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux/arch/x86/kernel/mpparse_32.c
===================================================================
--- linux.orig/arch/x86/kernel/mpparse_32.c
+++ linux/arch/x86/kernel/mpparse_32.c
@@ -76,6 +76,10 @@ unsigned disabled_cpus __cpuinitdata;
 /* Bitmask of physically existing CPUs */
 physid_mask_t phys_cpu_present_map;
 
+#ifndef CONFIG_SMP
+DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID;
+#endif
+
 /*
  * Intel MP BIOS table parsing routines:
  */
@@ -230,6 +234,7 @@ static void __cpuinit MP_processor_info 
 			def_to_bigsmp = 1;
 		}
 	}
+#ifdef CONFIG_SMP
 	/* are we being called early in kernel startup? */
 	if (x86_cpu_to_apicid_early_ptr) {
 		u16 *cpu_to_apicid = x86_cpu_to_apicid_early_ptr;
@@ -241,6 +246,7 @@ static void __cpuinit MP_processor_info 
 		per_cpu(x86_cpu_to_apicid, cpu) = m->mpc_apicid;
 		per_cpu(x86_bios_cpu_apicid, cpu) = m->mpc_apicid;
 	}
+#endif
 	cpu_set(cpu, cpu_present_map);
 }
 
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