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cpu/hotplug: Provide weak fallback for arch_cpuhp_init_parallel_bringup()

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CONFIG_HOTPLUG_PARALLEL expects the architecture to implement
arch_cpuhp_init_parallel_bringup() to decide whether paralllel hotplug is
possible and to do the necessary architecture specific initialization.

There are architectures which can enable it unconditionally and do not
require architecture specific initialization.

Provide a weak fallback for arch_cpuhp_init_parallel_bringup() so that
such architectures are not forced to implement empty stub functions.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20240716-loongarch-hotplug-v3-2-af59b3bb35c8@flygoat.com
This commit is contained in:
Jiaxun Yang 2024-07-16 22:14:59 +08:00 committed by Thomas Gleixner
parent c0e81a455e
commit 2dce993165
1 changed files with 5 additions and 0 deletions
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kernel/cpu.c
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@ -1829,6 +1829,11 @@ static inline const struct cpumask *cpuhp_get_primary_thread_mask(void)
}
#endif
bool __weak arch_cpuhp_init_parallel_bringup(void)
{
return true;
}
/*
* On architectures which have enabled parallel bringup this invokes all BP
* prepare states for each of the to be onlined APs first. The last state