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SubjectRe: [PATCH] ACPI/PPTT: Add acpi_pptt_warn_missing() to consolidate logs
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Hi,

On 2/7/19 10:14 AM, John Garry wrote:
> For a system using ACPI-based FW without a PPTT, we may get many warnings
> about the lack of a PPTT, as shown:
>
> root@(none)$ dmesg | grep -i pptt
> [ 0.010125] ACPI PPTT: No PPTT table found, cpu topology may be inaccurate
> [ 7.138339] ACPI PPTT: No PPTT table found, cache topology may be inaccurate
> [ 7.145368] ACPI PPTT: No PPTT table found, cache topology may be inaccurate
>
> These logs are generated with pr_warn_once(), so the intention was for a
> single log, but the logs overlap, so consolidate them.
>
> Signed-off-by: John Garry <john.garry@huawei.com>
>
> diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
> index da031b1df6f5..ad31c50de3be 100644
> --- a/drivers/acpi/pptt.c
> +++ b/drivers/acpi/pptt.c
> @@ -451,6 +451,11 @@ static struct acpi_pptt_processor *acpi_find_processor_package_id(struct acpi_ta
> return cpu;
> }
>
> +static void acpi_pptt_warn_missing(void)
> +{
> + pr_warn_once("No PPTT table found, cpu and cache topology may be inaccurate\n");
> +}
> +
> /**
> * topology_get_acpi_cpu_tag() - Find a unique topology value for a feature
> * @table: Pointer to the head of the PPTT table
> @@ -498,7 +503,7 @@ static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag)
>
> status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
> if (ACPI_FAILURE(status)) {
> - pr_warn_once("No PPTT table found, cpu topology may be inaccurate\n");
> + acpi_pptt_warn_missing();
> return -ENOENT;
> }
> retval = topology_get_acpi_cpu_tag(table, cpu, level, flag);
> @@ -531,7 +536,7 @@ int acpi_find_last_cache_level(unsigned int cpu)
> acpi_cpu_id = get_acpi_id_for_cpu(cpu);
> status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
> if (ACPI_FAILURE(status)) {
> - pr_warn_once("No PPTT table found, cache topology may be inaccurate\n");
> + acpi_pptt_warn_missing();
> } else {
> number_of_levels = acpi_find_cache_levels(table, acpi_cpu_id);
> acpi_put_table(table);
> @@ -563,7 +568,7 @@ int cache_setup_acpi(unsigned int cpu)
>
> status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
> if (ACPI_FAILURE(status)) {
> - pr_warn_once("No PPTT table found, cache topology may be inaccurate\n");
> + acpi_pptt_warn_missing();
> return -ENOENT;
> }
>
> @@ -617,7 +622,7 @@ int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
>
> status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
> if (ACPI_FAILURE(status)) {
> - pr_warn_once("No PPTT table found, topology may be inaccurate\n");
> + acpi_pptt_warn_missing();
> return -ENOENT;
> }
>
>

This all looks fine to me,

Reviewed-by: Jeremy Linton <jeremy.linton@arm.com>

Thanks!

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