linux-kernel - [PATCH 40/52] make x86_64 accept the max

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Date:	Mon,  3 Mar 2008 14:13:08 -0300
From:	Glauber Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, glommer@...il.com, mingo@...e.hu,
	tglx@...utronix.de, Glauber Costa <gcosta@...hat.com>
Subject: [PATCH 40/52] make x86_64 accept the max_cpus parameter

The parameter passing parsing is done in the common smpboot.c

Signed-off-by: Glauber Costa <gcosta@...hat.com>
---
 arch/x86/kernel/mpparse_64.c |    7 +++++++
 arch/x86/kernel/smpboot.c    |   12 ++++++++++++
 arch/x86/kernel/smpboot_32.c |   13 -------------
 3 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/mpparse_64.c b/arch/x86/kernel/mpparse_64.c
index 72ab140..2a1f788 100644
--- a/arch/x86/kernel/mpparse_64.c
+++ b/arch/x86/kernel/mpparse_64.c
@@ -32,6 +32,7 @@
 
 /* Have we found an MP table */
 int smp_found_config;
+unsigned int __cpuinitdata maxcpus = NR_CPUS;
 
 /*
  * Various Linux-internal data structures created from the
@@ -115,6 +116,12 @@ static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
 		return;
 	}
 
+	if (num_processors >= maxcpus) {
+		printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
+			" Processor ignored.\n", maxcpus);
+		return;
+	}
+
 	num_processors++;
 	cpus_complement(tmp_map, cpu_present_map);
 	cpu = first_cpu(tmp_map);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index c35cd31..34c3117 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -268,3 +268,15 @@ void __cpu_die(unsigned int cpu)
 }
 #endif
 
+/*
+ * If the BIOS enumerates physical processors before logical,
+ * maxcpus=N at enumeration-time can be used to disable HT.
+ */
+static int __init parse_maxcpus(char *arg)
+{
+	extern unsigned int maxcpus;
+
+	maxcpus = simple_strtoul(arg, NULL, 0);
+	return 0;
+}
+early_param("maxcpus", parse_maxcpus);
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 00b1b59..3236e84 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -1113,16 +1113,3 @@ void __init smp_intr_init(void)
 	/* IPI for generic function call */
 	set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
 }
-
-/*
- * If the BIOS enumerates physical processors before logical,
- * maxcpus=N at enumeration-time can be used to disable HT.
- */
-static int __init parse_maxcpus(char *arg)
-{
-	extern unsigned int maxcpus;
-
-	maxcpus = simple_strtoul(arg, NULL, 0);
-	return 0;
-}
-early_param("maxcpus", parse_maxcpus);
-- 
1.5.0.6

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