linux-kernel - Re: [RFT PATCH v5 3/5] cpu-topology: Move cpu topology code to common code.

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Message-ID: <b291e1da-47a7-32b9-ab36-90f65b2a961a@wdc.com>
Date:   Wed, 29 May 2019 10:24:44 -0700
From:   Atish Patra <atish.patra@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andreas Schwab <schwab@...e.de>,
        Anup Patel <anup@...infault.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Otto Sabart <ottosabart@...erm.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFT PATCH v5 3/5] cpu-topology: Move cpu topology code to common
 code.

On 5/29/19 3:48 AM, Sudeep Holla wrote:
> On Thu, May 23, 2019 at 05:06:50PM -0700, Atish Patra wrote:
>> Both RISC-V & ARM64 are using cpu-map device tree to describe
>> their cpu topology. It's better to move the relevant code to
>> a common place instead of duplicate code.
>>
> 
> I couldn't test this on any ARM64 server platforms, tested on Juno
> and other embedded platforms.
> 

Jeff had tested earlier patch series on ARM64 server platform.
Since then, the series has changed. Even though, I don't expect it break 
ARM64, if it can be verified again that would be great.

@Jeff: Can you give it a shot if you have some time ?

> Tested-by: Sudeep Holla <sudeep.holla@....com>
> Reviewed-by: Sudeep Holla <sudeep.holla@....com>
> 

Thanks!

>> Signed-off-by: Atish Patra <atish.patra@....com>
>> Tested-by: Jeffrey Hugo <jhugo@...eaurora.org>
>> ---
>>   arch/arm64/include/asm/topology.h |  23 ---
>>   arch/arm64/kernel/topology.c      | 303 +-----------------------------
>>   drivers/base/arch_topology.c      | 296 +++++++++++++++++++++++++++++
>>   include/linux/arch_topology.h     |  28 +++
>>   include/linux/topology.h          |   1 +
>>   5 files changed, 329 insertions(+), 322 deletions(-)
>>
> 
> [...]
> 
>> diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
>> index 0825c4a856e3..6b95c91e7d67 100644
>> --- a/arch/arm64/kernel/topology.c
>> +++ b/arch/arm64/kernel/topology.c
>>
> 
> [...]
> 
>> -static int __init parse_cluster(struct device_node *cluster, int depth)
>> -{
>> -	char name[10];
>> -	bool leaf = true;
>> -	bool has_cores = false;
>> -	struct device_node *c;
>> -	static int package_id __initdata;
>> -	int core_id = 0;
> 
> [Ultra minor nit]: you seem to have reordered the above declaration when
> you moved, just noticed as it showed up when comparing.
> 

Arrgh. Sorry!

I think I was trying to fix a checkpatch or something and forgot to 
revert. I will update it.

>> diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
>> index 1739d7e1952a..20a960131bee 100644
>> --- a/drivers/base/arch_topology.c
>> +++ b/drivers/base/arch_topology.c
> 
> [...]
> 
>> +
>> +static int __init parse_cluster(struct device_node *cluster, int depth)
>> +{
>> +	char name[10];
>> +	bool leaf = true;
>> +	bool has_cores = false;
>> +	int core_id = 0;
>> +	static int package_id __initdata;
>> +	struct device_node *c;
>> +	int i, ret;
>> +
> 
> [...]
> 
>> +#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
>> +void update_siblings_masks(unsigned int cpu);
>> +#endif
>> +void remove_cpu_topology(unsigned int cpuid);
>> +
> 
> Another thing(not a block and we can do it once this is merged) is to
> remove these #ifdefs
> 

This #ifdef is removed in patch 4.

But we should remove the other ones around init_cpu_topology, 
parse_dt_topology and friends in a follow up patch once this is merged.

> --
> Regards,
> Sudeep
> 


-- 
Regards,
Atish