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Date: Mon, 7 Aug 2023 15:53:52 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org, Tom Lendacky <thomas.lendacky@....com>,
Andrew Cooper <andrew.cooper3@...rix.com>,
Arjan van de Ven <arjan@...ux.intel.com>,
Huang Rui <ray.huang@....com>, Juergen Gross <jgross@...e.com>,
Dimitri Sivanich <dimitri.sivanich@....com>,
Michael Kelley <mikelley@...rosoft.com>,
Sohil Mehta <sohil.mehta@...el.com>,
K Prateek Nayak <kprateek.nayak@....com>,
Kan Liang <kan.liang@...ux.intel.com>,
Zhang Rui <rui.zhang@...el.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Feng Tang <feng.tang@...el.com>,
Andy Shevchenko <andy@...radead.org>
Subject: [patch 50/53] x86/cpu/topology: Rename smp_num_siblings
It's really a non-intuitive name. Rename it to __max_threads_per_core which
is obvious.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
arch/x86/include/asm/smp.h | 2 --
arch/x86/include/asm/topology.h | 6 +++++-
arch/x86/kernel/cpu/common.c | 4 ++--
arch/x86/kernel/cpu/debugfs.c | 2 +-
arch/x86/kernel/cpu/mce/inject.c | 2 +-
arch/x86/kernel/cpu/topology.c | 6 +++---
arch/x86/kernel/smpboot.c | 8 --------
7 files changed, 12 insertions(+), 18 deletions(-)
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -8,8 +8,6 @@
#include <asm/current.h>
#include <asm/thread_info.h>
-extern unsigned int smp_num_siblings;
-
DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);
DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_die_map);
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -145,6 +145,7 @@ extern const struct cpumask *cpu_cluster
extern unsigned int __max_dies_per_package;
extern unsigned int __max_logical_packages;
+extern unsigned int __max_threads_per_core;
static inline unsigned int topology_max_packages(void)
{
@@ -178,7 +179,10 @@ static inline int topology_max_smt_threa
return __max_smt_threads;
}
-bool topology_smt_supported(void);
+static inline bool topology_smt_supported(void)
+{
+ return __max_threads_per_core > 1;
+}
extern unsigned int __amd_nodes_per_pkg;
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -72,8 +72,8 @@
u32 elf_hwcap2 __read_mostly;
/* Number of siblings per CPU package */
-unsigned int smp_num_siblings __ro_after_init = 1;
-EXPORT_SYMBOL(smp_num_siblings);
+unsigned int __max_threads_per_core __ro_after_init = 1;
+EXPORT_SYMBOL(__max_threads_per_core);
unsigned int __max_dies_per_package __ro_after_init = 1;
EXPORT_SYMBOL(__max_dies_per_package);
--- a/arch/x86/kernel/cpu/debugfs.c
+++ b/arch/x86/kernel/cpu/debugfs.c
@@ -30,7 +30,7 @@ static int cpu_debug_show(struct seq_fil
seq_printf(m, "amd_nodes_per_pkg: %u\n", topology_amd_nodes_per_pkg());
seq_printf(m, "max_cores: %u\n", c->x86_max_cores);
seq_printf(m, "max_dies_per_pkg: %u\n", __max_dies_per_package);
- seq_printf(m, "smp_num_siblings: %u\n", smp_num_siblings);
+ seq_printf(m, "max_threads_per_core:%u\n", __max_threads_per_core);
return 0;
}
--- a/arch/x86/kernel/cpu/mce/inject.c
+++ b/arch/x86/kernel/cpu/mce/inject.c
@@ -433,7 +433,7 @@ static u32 get_nbc_for_node(int node_id)
struct cpuinfo_x86 *c = &boot_cpu_data;
u32 cores_per_node;
- cores_per_node = (c->x86_max_cores * smp_num_siblings) / topology_amd_nodes_per_pkg();
+ cores_per_node = (c->x86_max_cores * __max_threads_per_core) / topology_amd_nodes_per_pkg();
return cores_per_node * node_id;
}
--- a/arch/x86/kernel/cpu/topology.c
+++ b/arch/x86/kernel/cpu/topology.c
@@ -86,7 +86,7 @@ bool arch_match_cpu_phys_id(int cpu, u64
#ifdef CONFIG_SMP
static void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid)
{
- if (!(apicid & (smp_num_siblings - 1)))
+ if (!(apicid & (__max_threads_per_core - 1)))
cpumask_set_cpu(cpu, &__cpu_primary_thread_mask);
}
#else
@@ -427,8 +427,8 @@ void __init topology_init_possible_cpus(
cnta = domain_weight(TOPO_CORE_DOMAIN);
cntb = domain_weight(TOPO_SMT_DOMAIN);
- smp_num_siblings = 1U << (get_count_order(cntb) - get_count_order(cnta));
- pr_info("Max. threads per core: %3u\n", smp_num_siblings);
+ __max_threads_per_core = 1U << (get_count_order(cntb) - get_count_order(cnta));
+ pr_info("Max. threads per core: %3u\n", __max_threads_per_core);
pr_info("Allowing %u present CPUs plus %u hotplug CPUs\n", assigned, disabled);
if (topo_info.nr_rejected_cpus)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -320,14 +320,6 @@ static void notrace start_secondary(void
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
-/**
- * topology_smt_supported - Check whether SMT is supported by the CPUs
- */
-bool topology_smt_supported(void)
-{
- return smp_num_siblings > 1;
-}
-
void __init smp_store_boot_cpu_info(void)
{
struct cpuinfo_x86 *c = &cpu_data(0);
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