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Message-ID: <172647589238.2450257.17734472985835252214.tglx@xen13>
Date: Mon, 16 Sep 2024 10:38:37 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] smp/core for v6.12-rc1
Linus,
please pull the latest smp/core branch from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git smp-core-2024-09-16
up to: 1d07085402d1: smp: Mark smp_prepare_boot_cpu() __init
A set of updates for CPU hotplug:
- Prepare the core for supporting parallel hotplug on loongarch
- A small set of cleanups and enhancements
Thanks,
tglx
------------------>
Bibo Mao (1):
smp: Mark smp_prepare_boot_cpu() __init
Jiaxun Yang (2):
cpu/hotplug: Make HOTPLUG_PARALLEL independent of HOTPLUG_SMT
cpu/hotplug: Provide weak fallback for arch_cpuhp_init_parallel_bringup()
Thorsten Blum (1):
cpu: Fix W=1 build kernel-doc warning
arch/loongarch/kernel/smp.c | 2 +-
arch/mips/kernel/smp.c | 2 +-
arch/powerpc/kernel/smp.c | 2 +-
include/linux/smp.h | 2 +-
kernel/cpu.c | 20 +++++++++++++++++---
5 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
index ca405ab86aae..be2655c4c414 100644
--- a/arch/loongarch/kernel/smp.c
+++ b/arch/loongarch/kernel/smp.c
@@ -476,7 +476,7 @@ core_initcall(ipi_pm_init);
#endif
/* Preload SMP state for boot cpu */
-void smp_prepare_boot_cpu(void)
+void __init smp_prepare_boot_cpu(void)
{
unsigned int cpu, node, rr_node;
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 0362fc5df7b0..39e193cad2b9 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -439,7 +439,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
}
/* preload SMP state for boot cpu */
-void smp_prepare_boot_cpu(void)
+void __init smp_prepare_boot_cpu(void)
{
if (mp_ops->prepare_boot_cpu)
mp_ops->prepare_boot_cpu();
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 46e6d2cd7a2d..4ab9b8cee77a 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1166,7 +1166,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
cpu_smt_set_num_threads(num_threads, threads_per_core);
}
-void smp_prepare_boot_cpu(void)
+void __init smp_prepare_boot_cpu(void)
{
BUG_ON(smp_processor_id() != boot_cpuid);
#ifdef CONFIG_PPC64
diff --git a/include/linux/smp.h b/include/linux/smp.h
index fcd61dfe2af3..6a0813c905d0 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -109,7 +109,7 @@ static inline void on_each_cpu_cond(smp_cond_func_t cond_func,
* Architecture specific boot CPU setup. Defined as empty weak function in
* init/main.c. Architectures can override it.
*/
-void smp_prepare_boot_cpu(void);
+void __init smp_prepare_boot_cpu(void);
#ifdef CONFIG_SMP
diff --git a/kernel/cpu.c b/kernel/cpu.c
index b1fd2a3db91a..0c9c5dfc8ddd 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1808,6 +1808,7 @@ static int __init parallel_bringup_parse_param(char *arg)
}
early_param("cpuhp.parallel", parallel_bringup_parse_param);
+#ifdef CONFIG_HOTPLUG_SMT
static inline bool cpuhp_smt_aware(void)
{
return cpu_smt_max_threads > 1;
@@ -1817,6 +1818,21 @@ static inline const struct cpumask *cpuhp_get_primary_thread_mask(void)
{
return cpu_primary_thread_mask;
}
+#else
+static inline bool cpuhp_smt_aware(void)
+{
+ return false;
+}
+static inline const struct cpumask *cpuhp_get_primary_thread_mask(void)
+{
+ return cpu_none_mask;
+}
+#endif
+
+bool __weak arch_cpuhp_init_parallel_bringup(void)
+{
+ return true;
+}
/*
* On architectures which have enabled parallel bringup this invokes all BP
@@ -2689,9 +2705,7 @@ int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval)
return ret;
}
-/**
- * Check if the core a CPU belongs to is online
- */
+/* Check if the core a CPU belongs to is online */
#if !defined(topology_is_core_online)
static inline bool topology_is_core_online(unsigned int cpu)
{
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