linux-kernel - [PATCH 4/4] arch/arm: Rebuild sched_domain hierarchy when cpu capacity changes

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Message-Id: <1532093554-30504-5-git-send-email-morten.rasmussen@arm.com>
Date:   Fri, 20 Jul 2018 14:32:34 +0100
From:   Morten Rasmussen <morten.rasmussen@....com>
To:     peterz@...radead.org, mingo@...hat.com
Cc:     valentin.schneider@....com, dietmar.eggemann@....com,
        vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Morten Rasmussen <morten.rasmussen@....com>,
        Russell King <linux@...linux.org.uk>
Subject: [PATCH 4/4] arch/arm: Rebuild sched_domain hierarchy when cpu capacity changes

Asymmetric cpu capacity can not necessarily be determined accurately at
the time the initial sched_domain hierarchy is built during boot. It is
therefore necessary to be able to force a full rebuild of the hierarchy
later triggered by the arch_topology driver. A full rebuild requires the
arch-code to implement arch_update_cpu_topology() which isn't yet
implemented for arm. This patch points the arm implementation to
arch_topology driver to ensure that full hierarchy rebuild happens when
needed.

cc: Russell King <linux@...linux.org.uk>

Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
---
 arch/arm/include/asm/topology.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h
index 5d88d2f22b2c..2a786f54d8b8 100644
--- a/arch/arm/include/asm/topology.h
+++ b/arch/arm/include/asm/topology.h
@@ -33,6 +33,9 @@ const struct cpumask *cpu_coregroup_mask(int cpu);
 /* Replace task scheduler's default cpu-invariant accounting */
 #define arch_scale_cpu_capacity topology_get_cpu_scale
 
+/* Enable topology flag updates */
+#define arch_update_cpu_topology topology_update_cpu_topology
+
 #else
 
 static inline void init_cpu_topology(void) { }
-- 
2.7.4