linux-kernel - [PATCH v3 2/3] cpu/hotplug: Weak fallback for arch_cpuhp_init_parallel

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Message-Id: <20240716-loongarch-hotplug-v3-2-af59b3bb35c8@flygoat.com>
Date: Tue, 16 Jul 2024 22:14:59 +0800
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Thomas Gleixner <tglx@...utronix.de>, 
 Peter Zijlstra <peterz@...radead.org>, Huacai Chen <chenhuacai@...nel.org>, 
 WANG Xuerui <kernel@...0n.name>
Cc: linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev, 
 Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v3 2/3] cpu/hotplug: Weak fallback for
 arch_cpuhp_init_parallel_bringup

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@...goat.com>
---
 kernel/cpu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index c89e0e91379a..16323610cd20 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -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

-- 
2.45.2