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Message-ID: <20230508185217.839754797@linutronix.de>
Date: Mon, 8 May 2023 21:43:44 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org, David Woodhouse <dwmw2@...radead.org>,
Andrew Cooper <andrew.cooper3@...rix.com>,
Brian Gerst <brgerst@...il.com>,
Arjan van de Veen <arjan@...ux.intel.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Paul McKenney <paulmck@...nel.org>,
Tom Lendacky <thomas.lendacky@....com>,
Sean Christopherson <seanjc@...gle.com>,
Oleksandr Natalenko <oleksandr@...alenko.name>,
Paul Menzel <pmenzel@...gen.mpg.de>,
"Guilherme G. Piccoli" <gpiccoli@...lia.com>,
Piotr Gorski <lucjan.lucjanov@...il.com>,
Usama Arif <usama.arif@...edance.com>,
Juergen Gross <jgross@...e.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
xen-devel@...ts.xenproject.org,
Russell King <linux@...linux.org.uk>,
Arnd Bergmann <arnd@...db.de>,
linux-arm-kernel@...ts.infradead.org,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
linux-csky@...r.kernel.org,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
linux-mips@...r.kernel.org,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
linux-riscv@...ts.infradead.org,
Mark Rutland <mark.rutland@....com>,
Sabin Rapan <sabrapan@...zon.com>,
"Michael Kelley (LINUX)" <mikelley@...rosoft.com>
Subject: [patch v3 11/36] [patch V2 11/38] x86/smpboot: Move synchronization
masks to SMP boot code
From: Thomas Gleixner <tglx@...utronix.de>
The usage is in smpboot.c and not in the CPU initialization code.
The XEN_PV usage of cpu_callout_mask is obsolete as cpu_init() not longer
waits and cacheinfo has its own CPU mask now, so cpu_callout_mask can be
made static too.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Michael Kelley <mikelley@...rosoft.com>
---
arch/x86/include/asm/cpumask.h | 5 -----
arch/x86/kernel/cpu/common.c | 17 -----------------
arch/x86/kernel/smpboot.c | 16 ++++++++++++++++
arch/x86/xen/smp_pv.c | 3 ---
4 files changed, 16 insertions(+), 25 deletions(-)
---
--- a/arch/x86/include/asm/cpumask.h
+++ b/arch/x86/include/asm/cpumask.h
@@ -4,11 +4,6 @@
#ifndef __ASSEMBLY__
#include <linux/cpumask.h>
-extern cpumask_var_t cpu_callin_mask;
-extern cpumask_var_t cpu_callout_mask;
-extern cpumask_var_t cpu_initialized_mask;
-extern cpumask_var_t cpu_sibling_setup_mask;
-
extern void setup_cpu_local_masks(void);
/*
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -67,14 +67,6 @@
u32 elf_hwcap2 __read_mostly;
-/* all of these masks are initialized in setup_cpu_local_masks() */
-cpumask_var_t cpu_initialized_mask;
-cpumask_var_t cpu_callout_mask;
-cpumask_var_t cpu_callin_mask;
-
-/* representing cpus for which sibling maps can be computed */
-cpumask_var_t cpu_sibling_setup_mask;
-
/* Number of siblings per CPU package */
int smp_num_siblings = 1;
EXPORT_SYMBOL(smp_num_siblings);
@@ -169,15 +161,6 @@ static void ppin_init(struct cpuinfo_x86
clear_cpu_cap(c, info->feature);
}
-/* correctly size the local cpu masks */
-void __init setup_cpu_local_masks(void)
-{
- alloc_bootmem_cpumask_var(&cpu_initialized_mask);
- alloc_bootmem_cpumask_var(&cpu_callin_mask);
- alloc_bootmem_cpumask_var(&cpu_callout_mask);
- alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
-}
-
static void default_init(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_X86_64
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -101,6 +101,13 @@ EXPORT_PER_CPU_SYMBOL(cpu_die_map);
DEFINE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
EXPORT_PER_CPU_SYMBOL(cpu_info);
+/* All of these masks are initialized in setup_cpu_local_masks() */
+static cpumask_var_t cpu_initialized_mask;
+static cpumask_var_t cpu_callout_mask;
+static cpumask_var_t cpu_callin_mask;
+/* Representing CPUs for which sibling maps can be computed */
+static cpumask_var_t cpu_sibling_setup_mask;
+
/* Logical package management. We might want to allocate that dynamically */
unsigned int __max_logical_packages __read_mostly;
EXPORT_SYMBOL(__max_logical_packages);
@@ -1548,6 +1555,15 @@ early_param("possible_cpus", _setup_poss
set_cpu_possible(i, true);
}
+/* correctly size the local cpu masks */
+void __init setup_cpu_local_masks(void)
+{
+ alloc_bootmem_cpumask_var(&cpu_initialized_mask);
+ alloc_bootmem_cpumask_var(&cpu_callin_mask);
+ alloc_bootmem_cpumask_var(&cpu_callout_mask);
+ alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
+}
+
#ifdef CONFIG_HOTPLUG_CPU
/* Recompute SMT state for all CPUs on offline */
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -254,15 +254,12 @@ cpu_initialize_context(unsigned int cpu,
struct desc_struct *gdt;
unsigned long gdt_mfn;
- /* used to tell cpu_init() that it can proceed with initialization */
- cpumask_set_cpu(cpu, cpu_callout_mask);
if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
return 0;
ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
if (ctxt == NULL) {
cpumask_clear_cpu(cpu, xen_cpu_initialized_map);
- cpumask_clear_cpu(cpu, cpu_callout_mask);
return -ENOMEM;
}
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