Re: [PATCH v2 02/29] ACPI / PPTT: Stop acpi_count_levels() expecting callers to clear levels

[Gavin Shan]

On 9/11/25 6:42 AM, James Morse wrote:
> In acpi_count_levels(), the initial value of *levels passed by the
> caller is really an implementation detail of acpi_count_levels(), so it
> is unreasonable to expect the callers of this function to know what to
> pass in for this parameter.  The only sensible initial value is 0,
> which is what the only upstream caller (acpi_get_cache_info()) passes.
>
> Use a local variable for the starting cache level in acpi_count_levels(),
> and pass the result back to the caller via the function return value.
>
> Gid rid of the levels parameter, which has no remaining purpose.
>
> Fix acpi_get_cache_info() to match.
>
> Suggested-by: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>
> Signed-off-by: James Morse <james.morse@xxxxxxx>
> Reviewed-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
> ---
> Changes since v1:
>   * Rewritten commit message from Dave.
>   * Minor changes to kernel doc comment.
>   * Keep the much loved typo.
>
> Changes since RFC:
>   * Made acpi_count_levels() return the levels value.
> ---
>   drivers/acpi/pptt.c | 20 ++++++++++++--------
>   1 file changed, 12 insertions(+), 8 deletions(-)

Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>