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SubjectRe: [PATCH RFC 21/22] riscv: Switch over to GENERIC_CPU_DEVICES
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On Tue, 07 Nov 2023 02:31:06 PST (-0800), rmk+kernel@armlinux.org.uk wrote:
> From: James Morse <james.morse@arm.com>
>
> 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>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
> ---
> Changes since RFC v2:
> * Add note about initialisation order change.
> ---
> 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 eaa15a20e6ae..264aa466aec3 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 0624f44d43ec..f8875ae1b0aa 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -50,7 +50,6 @@ 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
> @@ -295,23 +294,13 @@ 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)
> {

Acked-by: Palmer Dabbelt <palmer@rivosinc.com>

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