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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250911114623.00007cd3@huawei.com>
Date: Thu, 11 Sep 2025 11:46:23 +0100
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: James Morse <james.morse@....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

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>