Hi Dietmar,
On 18 October 2017 at 12:37, Dietmar Eggemann <dietmar.eggem...@arm.com> wrote:
> Hi Vincent,
>
> On 17/10/17 13:28, Vincent Guittot wrote:
>> Hi Dietmar,
>>
>> On 12 October 2017 at 16:00, Dietmar Eggemann <dietmar.eggem...@arm.com>
>> wrote:
>>> Remove the 'cpu_efficiency/clock-frequency dt property' based solution
>>> to set cpu capacity which was only working for Cortex-A15/A7 arm
>>> big.LITTLE systems.
>>>
>>> I.e. the 'capacity-dmips-mhz' based solution is now the only one. It is
>>> shared between arm and arm64 and works for every big.LITTLE system no
>>> matter which core types it consists of.
>>>
>>> Cc: Russell King <li...@arm.linux.org.uk>
>>> Cc: Vincent Guittot <vincent.guit...@linaro.org>
>>> Cc: Juri Lelli <juri.le...@gmail.com>
>>> Signed-off-by: Dietmar Eggemann <dietmar.eggem...@arm.com>
>
> [...]
>
>>> @@ -111,76 +50,15 @@ static void __init parse_dt_topology(void)
>>> continue;
>>> }
>>>
>>> - if (topology_parse_cpu_capacity(cn, cpu)) {
>>> + if (topology_parse_cpu_capacity(cn, cpu))
>>> of_node_put(cn);
>>
>> We should call the of_node_put unconditionally to balance the
>> of_get_cpu_node, isn't it ?
>> Note that this problem is also present without your change
>
> Thanks for the review. Brendan mentioned this the other day already.
>
> I could add an additional patch to the v3 with this code change. What do
> you think?
The changes looks good to me
>
> diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
> index 15cc131ae387..81ec42333489 100644
> --- a/arch/arm/kernel/topology.c
> +++ b/arch/arm/kernel/topology.c
> @@ -41,6 +41,7 @@ static void __init parse_dt_topology(void)
> pr_err("No CPU information found in DT\n");
> return;
> }
> + of_node_put(cn);
>
> for_each_possible_cpu(cpu) {
> /* too early to use cpu->of_node */
> @@ -50,8 +51,8 @@ static void __init parse_dt_topology(void)
> continue;
> }
>
> - if (topology_parse_cpu_capacity(cn, cpu))
> - of_node_put(cn);
> + topology_parse_cpu_capacity(cn, cpu);
> + of_node_put(cn);
> }
>
> topology_normalize_cpu_scale();
>
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