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

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Message-ID: <9e5b267d-3b4d-49bb-946c-dd501ca64e54@arm.com>
Date: Fri, 19 Sep 2025 17:10:30 +0100
From: James Morse <james.morse@....com>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-acpi@...r.kernel.org,
 D Scott Phillips OS <scott@...amperecomputing.com>,
 carl@...amperecomputing.com, lcherian@...vell.com,
 bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com,
 baolin.wang@...ux.alibaba.com, Jamie Iles <quic_jiles@...cinc.com>,
 Xin Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
 dfustini@...libre.com, amitsinght@...vell.com,
 David Hildenbrand <david@...hat.com>, Dave Martin <dave.martin@....com>,
 Koba Ko <kobak@...dia.com>, Shanker Donthineni <sdonthineni@...dia.com>,
 fenghuay@...dia.com, baisheng.gao@...soc.com, Rob Herring <robh@...nel.org>,
 Rohit Mathew <rohit.mathew@....com>, Rafael Wysocki <rafael@...nel.org>,
 Len Brown <lenb@...nel.org>, Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Hanjun Guo <guohanjun@...wei.com>, Sudeep Holla <sudeep.holla@....com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Danilo Krummrich <dakr@...nel.org>
Subject: Re: [PATCH v2 02/29] ACPI / PPTT: Stop acpi_count_levels() expecting
 callers to clear levels

Hi Jonathan,

On 11/09/2025 11:46, Jonathan Cameron wrote:
> On Wed, 10 Sep 2025 20:42:42 +0000
> James Morse <james.morse@....com> 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@...wei.com>
>> Signed-off-by: James Morse <james.morse@....com>
>> Reviewed-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>


Thanks!

James