From: James Morse <james.morse@arm.com> mainline inclusion from mainline-v6.8-rc1 commit 96cf2036514acec9bee7c25ca61badc64820d734 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8XMTL CVE: NA ---------------------------------- Now that GENERIC_CPU_DEVICES calls arch_register_cpu(), which can be overridden by the arch code, switch over to this to allow common code to choose when the register_cpu() call is made. This allows topology_init() to be removed. This is an intermediate step to the logic being moved to drivers/acpi, where GENERIC_CPU_DEVICES will do the work when booting with acpi=off. This patch also has the effect of moving the registration of CPUs from subsys to driver core initialisation, prior to any initcalls running. Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Acked-by: Palmer Dabbelt <palmer@rivosinc.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Signed-off-by: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk> Reviewed-by: Samuel Holland <samuel.holland@sifive.com> Tested-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/E1r5R4G-00Ct0M-PS@rmk-PC.armlinux.org.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: liwei <liwei728@huawei.com> --- arch/riscv/Kconfig | 1 + arch/riscv/kernel/setup.c | 19 ++++--------------- 2 files changed, 5 insertions(+), 15 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 9c48fecc6719..18646dee0f53 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -69,6 +69,7 @@ config RISCV select GENERIC_ARCH_TOPOLOGY select GENERIC_ATOMIC64 if !64BIT select GENERIC_CLOCKEVENTS_BROADCAST if SMP + select GENERIC_CPU_DEVICES select GENERIC_EARLY_IOREMAP select GENERIC_ENTRY select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index aac853ae4eb7..311e99741cf8 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -62,7 +62,6 @@ atomic_t hart_lottery __section(".sdata") #endif ; unsigned long boot_cpu_hartid; -static DEFINE_PER_CPU(struct cpu, cpu_devices); /* * Place kernel memory regions on the resource tree so that @@ -307,23 +306,13 @@ void __init setup_arch(char **cmdline_p) riscv_set_dma_cache_alignment(); } -static int __init topology_init(void) +int arch_register_cpu(int cpu) { - int i, ret; + struct cpu *c = &per_cpu(cpu_devices, cpu); - for_each_possible_cpu(i) { - struct cpu *cpu = &per_cpu(cpu_devices, i); - - cpu->hotpluggable = cpu_has_hotplug(i); - ret = register_cpu(cpu, i); - if (unlikely(ret)) - pr_warn("Warning: %s: register_cpu %d failed (%d)\n", - __func__, i, ret); - } - - return 0; + c->hotpluggable = cpu_has_hotplug(cpu); + return register_cpu(c, cpu); } -subsys_initcall(topology_init); void free_initmem(void) { -- 2.25.1