linux-kernel - [PATCH v2 3/8] x86, cpu: provide a function topology_num

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Date:   Thu,  1 Sep 2016 13:33:39 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     rjw@...ysocki.net, tglx@...utronix.de, mingo@...hat.com,
        bp@...e.de, peterz@...radead.org
Cc:     x86@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        tim.c.chen@...ux.intel.com,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH v2 3/8] x86, cpu: provide a function topology_num_packages to enumerate #packages

From: Tim Chen <tim.c.chen@...ux.intel.com>

We compute the the number of active packages during boot and
topology update.  Provide a function to export this info for
functions that need this topology info.

Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 arch/x86/include/asm/topology.h | 1 +
 arch/x86/kernel/smpboot.c       | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 98b669d..0bcf3b7 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -129,6 +129,7 @@ static inline int topology_max_smt_threads(void)
 }
 
 int topology_update_package_map(unsigned int apicid, unsigned int cpu);
+extern int topology_num_packages(void);
 extern int topology_phys_to_logical_pkg(unsigned int pkg);
 #else
 #define topology_max_packages()			(1)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 3782bd4..292df31 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -297,6 +297,11 @@ found:
 	return 0;
 }
 
+int topology_num_packages(void)
+{
+	return logical_packages;
+}
+
 /**
  * topology_phys_to_logical_pkg - Map a physical package id to a logical
  *
-- 
2.7.4