linux-kernel - Re: [PATCH] riscv: Move call to init_cpu_topology() to later initialization stage

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Message-ID: <20230103065411.2l7k6r57v4phrnos@orel>
Date:   Tue, 3 Jan 2023 07:54:11 +0100
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Ley Foon Tan <leyfoon.tan@...rfivetech.com>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ley Foon Tan <lftan.linux@...il.com>
Subject: Re: [PATCH] riscv: Move call to init_cpu_topology() to later
 initialization stage

On Tue, Jan 03, 2023 at 11:53:16AM +0800, Ley Foon Tan wrote:
> topology_parse_cpu_capacity() is failed to allocate memory with kcalloc()
> after read "capacity-dmips-mhz" DT parameter in CPU DT nodes. This
> topology_parse_cpu_capacity() is called from init_cpu_topology(), move
> call to init_cpu_topology() to later initialization  stage (after memory
> allocation is available).
> 
> Note, this refers to ARM64 implementation, call init_cpu_topology() in
> smp_prepare_cpus().
> 
> Tested on Qemu platform.

Hi Ley,

Can you provide the topologies (command lines) tested?

> 
> Signed-off-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>

Fixes tag?

> 
> ---
> 
> In drivers/base/arch_topology.c: topology_parse_cpu_capacity():
> 
> 	ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz",
> 				   &cpu_capacity);
> 	if (!ret) {
> 		if (!raw_capacity) {
> 			raw_capacity = kcalloc(num_possible_cpus(),
> 					       sizeof(*raw_capacity),
> 					       GFP_KERNEL);
> 			if (!raw_capacity) {
> 				cap_parsing_failed = true;
> 				return false;
> 			}
> ---
>  arch/riscv/kernel/smpboot.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> index 3373df413c88..ddb2afba6d25 100644
> --- a/arch/riscv/kernel/smpboot.c
> +++ b/arch/riscv/kernel/smpboot.c
> @@ -39,7 +39,6 @@ static DECLARE_COMPLETION(cpu_running);
>  
>  void __init smp_prepare_boot_cpu(void)
>  {
> -	init_cpu_topology();
>  }
>  
>  void __init smp_prepare_cpus(unsigned int max_cpus)
> @@ -48,6 +47,8 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
>  	int ret;
>  	unsigned int curr_cpuid;
>  
> +	init_cpu_topology();
> +
>  	curr_cpuid = smp_processor_id();
>  	store_cpu_topology(curr_cpuid);
>  	numa_store_cpu_info(curr_cpuid);
> -- 
> 2.25.1
>

Otherwise,

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>

Thanks,
drew