linux-kernel - [tip: sched/core] ARM, sched/topology: Revert back to default scheduler topology

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Message-ID: <159784577092.3192.9588870511768297238.tip-bot2@tip-bot2>
Date:   Wed, 19 Aug 2020 14:02:50 -0000
From:   "tip-bot2 for Valentin Schneider" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Dietmar Eggemann <dietmar.eggemann@....com>,
        Valentin Schneider <valentin.schneider@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: sched/core] ARM, sched/topology: Revert back to default
 scheduler topology

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     d23b3bf8e43faa54a6839aafd6fedc15a3c4174f
Gitweb:        https://git.kernel.org/tip/d23b3bf8e43faa54a6839aafd6fedc15a3c4174f
Author:        Valentin Schneider <valentin.schneider@....com>
AuthorDate:    Mon, 17 Aug 2020 12:29:48 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 19 Aug 2020 10:49:47 +02:00

ARM, sched/topology: Revert back to default scheduler topology

The ARM-specific GMC level is meant to be built using the thread sibling
mask, but no devicetree in arch/arm/boot/dts uses the 'thread' cpu-map
binding. With SD_SHARE_POWERDOMAIN gone, this topology level can be
removed, at which point ARM no longer benefits from having a custom defined
topology table.

Delete the GMC topology level by making ARM use the default scheduler
topology table. This essentially reverts commit:

  fb2aa85564f4 ("sched, ARM: Create a dedicated scheduler topology table")

No change in functionality is expected.

Suggested-by: Dietmar Eggemann <dietmar.eggemann@....com>
Signed-off-by: Valentin Schneider <valentin.schneider@....com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@....com>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: https://lore.kernel.org/r/20200817113003.20802-3-valentin.schneider@arm.com
---
 arch/arm/kernel/topology.c | 26 --------------------------
 1 file changed, 26 deletions(-)

diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 353f3ee..ef0058d 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -178,15 +178,6 @@ static inline void update_cpu_capacity(unsigned int cpuid) {}
 #endif
 
 /*
- * The current assumption is that we can power gate each core independently.
- * This will be superseded by DT binding once available.
- */
-const struct cpumask *cpu_corepower_mask(int cpu)
-{
-	return &cpu_topology[cpu].thread_sibling;
-}
-
-/*
  * store_cpu_topology is called at boot when only one cpu is running
  * and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
  * which prevents simultaneous write access to cpu_topology array
@@ -241,20 +232,6 @@ topology_populated:
 	update_siblings_masks(cpuid);
 }
 
-static inline int cpu_corepower_flags(void)
-{
-	return SD_SHARE_PKG_RESOURCES;
-}
-
-static struct sched_domain_topology_level arm_topology[] = {
-#ifdef CONFIG_SCHED_MC
-	{ cpu_corepower_mask, cpu_corepower_flags, SD_INIT_NAME(GMC) },
-	{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
-#endif
-	{ cpu_cpu_mask, SD_INIT_NAME(DIE) },
-	{ NULL, },
-};
-
 /*
  * init_cpu_topology is called at boot when only one cpu is running
  * which prevent simultaneous write access to cpu_topology array
@@ -265,7 +242,4 @@ void __init init_cpu_topology(void)
 	smp_wmb();
 
 	parse_dt_topology();
-
-	/* Set scheduler topology descriptor */
-	set_sched_topology(arm_topology);
 }