Re: [PATCH v3 11/16] arch_topology: Check for non-negative value rather than -1 for IDs validity

Gavin Shan
2022-06-01T03:40:18Z

On 5/25/22 4:14 PM, Sudeep Holla wrote:
> Instead of just comparing the cpu topology IDs with -1 to check their
> validity, improve that by checking for a valid non-negative value.
>
> Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
> drivers/base/arch_topology.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>

Reviewed-by: Gavin Shan <gshan@redhat.com>

> diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
> index 59dc2c80c439..f73a5e669e42 100644
> --- a/drivers/base/arch_topology.c
> +++ b/drivers/base/arch_topology.c
> @@ -637,7 +637,7 @@ static int __init parse_dt_topology(void)
> * only mark cores described in the DT as possible.
> */
> for_each_possible_cpu(cpu)
> - if (cpu_topology[cpu].package_id == -1)
> + if (cpu_topology[cpu].package_id < 0)
> ret = -EINVAL;
>
> out_map:
> @@ -709,7 +709,7 @@ void update_siblings_masks(unsigned int cpuid)
> if (cpuid_topo->cluster_id != cpu_topo->cluster_id)
> continue;
>
> - if (cpuid_topo->cluster_id != -1) {
> + if (cpuid_topo->cluster_id >= 0) {
> cpumask_set_cpu(cpu, &cpuid_topo->cluster_sibling);
> cpumask_set_cpu(cpuid, &cpu_topo->cluster_sibling);
> }