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

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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:

  fb2aa85564 ("sched, ARM: Create a dedicated scheduler topology table")

No change in functionality is expected.

Suggested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/20200817113003.20802-3-valentin.schneider@arm.com
This commit is contained in:
Valentin Schneider 2020-08-17 12:29:48 +01:00 committed by Ingo Molnar
parent cfe7ddcbd7
commit d23b3bf8e4
1 changed files with 0 additions and 26 deletions
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26
arch/arm/kernel/topology.c
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@ -177,15 +177,6 @@ static inline void parse_dt_topology(void) {}
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* This will be superseded by DT binding once available.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,
@ -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);
}