linux-kernel - [GIT PULL] x86/smpboot change for v3.1

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Date:	Sat, 23 Jul 2011 11:37:10 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] x86/smpboot change for v3.1

Linus,

Please pull the latest x86-smpboot-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-smpboot-for-linus

 Thanks,

	Ingo

------------------>
Vivek Goyal (1):
      x86, boot: Wait for boot cpu to show up if nr_cpus limit is about to hit


 arch/x86/kernel/apic/apic.c |   22 ++++++++++++++++++++--
 1 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index b9338b8..68219a9 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1943,10 +1943,28 @@ void disconnect_bsp_APIC(int virt_wire_setup)
 
 void __cpuinit generic_processor_info(int apicid, int version)
 {
-	int cpu;
+	int cpu, max = nr_cpu_ids;
+	bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid,
+				phys_cpu_present_map);
+
+	/*
+	 * If boot cpu has not been detected yet, then only allow upto
+	 * nr_cpu_ids - 1 processors and keep one slot free for boot cpu
+	 */
+	if (!boot_cpu_detected && num_processors >= nr_cpu_ids - 1 &&
+	    apicid != boot_cpu_physical_apicid) {
+		int thiscpu = max + disabled_cpus - 1;
+
+		pr_warning(
+			"ACPI: NR_CPUS/possible_cpus limit of %i almost"
+			" reached. Keeping one slot for boot cpu."
+			"  Processor %d/0x%x ignored.\n", max, thiscpu, apicid);
+
+		disabled_cpus++;
+		return;
+	}
 
 	if (num_processors >= nr_cpu_ids) {
-		int max = nr_cpu_ids;
 		int thiscpu = max + disabled_cpus;
 
 		pr_warning(
--
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