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[PATCH 07/37] Don't assume boot CPU is CPU0 if MIPS_DISABLE_BOOT_CPU_ZER

To: linux-mips@linux-mips.org
Subject: [PATCH 07/37] Don't assume boot CPU is CPU0 if MIPS_DISABLE_BOOT_CPU_ZERO set.
From: ddaney@caviumnetworks.com
Date: Thu, 23 Oct 2008 17:56:31 -0700
Cc: David Daney <ddaney@caviumnetworks.com>, Tomaso Paoletti <tpaoletti@caviumnetworks.com>, Paul Gortmaker <Paul.Gortmaker@windriver.com>
In-reply-to: <1224809821-5532-1-git-send-email-ddaney@caviumnetworks.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1224809821-5532-1-git-send-email-ddaney@caviumnetworks.com>
Sender: linux-mips-bounce@linux-mips.org
From: David Daney <ddaney@caviumnetworks.com>

MIPS SMP code currently assumes that the boot CPU will be CPU0
of the system.  For some systems, this may not be the case.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: Paul Gortmaker <Paul.Gortmaker@windriver.com>
---
 arch/mips/Kconfig      |    4 ++++
 arch/mips/kernel/smp.c |    2 ++
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index b905744..5f832ee 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -746,6 +746,10 @@ config HOTPLUG_CPU
        bool
        default n
 
+config MIPS_DISABLE_BOOT_CPU_ZERO
+       bool
+       default n
+
 config I8259
        bool
 
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index b79ea70..e2597ef 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -195,12 +195,14 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 /* preload SMP state for boot cpu */
 void __devinit smp_prepare_boot_cpu(void)
 {
+#ifndef MIPS_DISABLE_BOOT_CPU_ZERO
        /*
         * This assumes that bootup is always handled by the processor
         * with the logic and physical number 0.
         */
        __cpu_number_map[0] = 0;
        __cpu_logical_map[0] = 0;
+#endif
        cpu_set(0, phys_cpu_present_map);
        cpu_set(0, cpu_online_map);
        cpu_set(0, cpu_callin_map);
-- 
1.5.5.1


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