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From 32b4c21d163c96ff9fa1829c7a4f325aca0655a7 Mon Sep 17 00:00:00 2001
From: Tim Chen <tim.c.chen@linux.intel.com>
Date: Tue, 22 Nov 2016 12:23:54 -0800
Subject: [PATCH 20/92] x86/topology: Define x86's arch_update_cpu_topology
The scheduler calls arch_update_cpu_topology() to check whether the
scheduler domains have to be rebuilt.
So far x86 has no requirement for this, but the upcoming ITMT support
makes this necessary.
Request the rebuild when the x86 internal update flag is set.
Suggested-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Cc: linux-pm@vger.kernel.org
Cc: peterz@infradead.org
Cc: jolsa@redhat.com
Cc: rjw@rjwysocki.net
Cc: linux-acpi@vger.kernel.org
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: bp@suse.de
Link: http://lkml.kernel.org/r/bfbf5591276ec60b2af2da798adc1060df1e2a5f.1479844244.git.tim.c.chen@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
(cherry picked from commit 7d25127cef44924f1013d119ba385095ca4b4a83)
Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
---
arch/x86/include/asm/topology.h | 1 +
arch/x86/kernel/smpboot.c | 11 +++++++++++
2 files changed, 12 insertions(+)
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index cf75871..a5ca88a 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -146,4 +146,5 @@ static inline void arch_fix_phys_package_id(int num, u32 slot)
int x86_pci_root_bus_node(int bus);
void x86_pci_root_bus_resources(int bus, struct list_head *resources);
+extern bool x86_topology_update;
#endif /* _ASM_X86_TOPOLOGY_H */
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 42f5eb7..ac61ee7 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -109,6 +109,17 @@
/* Maximum number of SMT threads on any online core */
int __max_smt_threads __read_mostly;
+/* Flag to indicate if a complete sched domain rebuild is required */
+bool x86_topology_update;
+
+int arch_update_cpu_topology(void)
+{
+ int retval = x86_topology_update;
+
+ x86_topology_update = false;
+ return retval;
+}
+
static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
{
unsigned long flags;
--
1.9.1
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