linux-kernel - [PATCH 2/3] x86, amd: Provide accessor for number of nodes

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Date:	Tue, 9 Jun 2015 11:45:16 -0500
From:	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
To:	<dougthompson@...ssion.com>, <bp@...en8.de>,
	<mchehab@....samsung.com>
CC:	<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
	Jacob Shin <jacob.w.shin@...il.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	"Paolo Bonzini" <pbonzini@...hat.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"Hector Marco-Gisbert" <hecmargi@....es>
Subject: [PATCH 2/3] x86, amd: Provide accessor for number of nodes

Add an accessor function amd_get_nodes_cnt() which returns
the number of nodes per socket.

In a subsequent patch, we will use this info in EDAC
mce_amd_inj module.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Jacob Shin <jacob.w.shin@...il.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Hector Marco-Gisbert <hecmargi@....es>
Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
---
 arch/x86/include/asm/processor.h | 1 +
 arch/x86/kernel/cpu/amd.c        | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 8e04f51..34faf24 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -820,6 +820,7 @@ static inline int mpx_disable_management(struct task_struct *tsk)
 #endif /* CONFIG_X86_INTEL_MPX */
 
 extern u16 amd_get_nb_id(int cpu);
+extern u32 amd_get_nodes_cnt(void);
 
 static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
 {
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 487083b..788655a 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -373,6 +373,12 @@ u16 amd_get_nb_id(int cpu)
 }
 EXPORT_SYMBOL_GPL(amd_get_nb_id);
 
+u32 amd_get_nodes_cnt(void)
+{
+	return nodes_per_processor;
+}
+EXPORT_SYMBOL_GPL(amd_get_nodes_cnt);
+
 static void srat_detect_node(struct cpuinfo_x86 *c)
 {
 #ifdef CONFIG_NUMA
-- 
2.4.0

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