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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-28e8d1b8444sm32362015ad.86.2025.10.02.17.17.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Oct 2025 17:17:32 -0700 (PDT) Message-ID: <37614dc9-91dc-445d-b289-1346e216dcae@redhat.com> Date: Fri, 3 Oct 2025 10:17:20 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/29] ACPI / PPTT: Stop acpi_count_levels() expecting callers to clear levels To: James Morse , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org Cc: D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Dave Martin , Koba Ko , Shanker Donthineni , fenghuay@nvidia.com, baisheng.gao@unisoc.com, Jonathan Cameron , Rob Herring , Rohit Mathew , Rafael Wysocki , Len Brown , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich References: <20250910204309.20751-1-james.morse@arm.com> <20250910204309.20751-3-james.morse@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20250910204309.20751-3-james.morse@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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 > Signed-off-by: James Morse > Reviewed-by: Lorenzo Pieralisi > --- > 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