linux-kernel - Re: [PATCH 10/33] arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate

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Message-ID: <3942e5f8-7497-4d23-90e2-1b2db49a48c2@web.de>
Date: Fri, 22 Aug 2025 21:15:12 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: James Morse <james.morse@....com>, linux-arm-kernel@...ts.infradead.org,
 linux-acpi@...r.kernel.org, devicetree@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>,
 Amit Singh Tomar <amitsinght@...vell.com>,
 Baisheng Gao <baisheng.gao@...soc.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, bobo.shaobowang@...wei.com,
 Carl Worth <carl@...amperecomputing.com>,
 Catalin Marinas <catalin.marinas@....com>, Conor Dooley
 <conor+dt@...nel.org>, Danilo Krummrich <dakr@...nel.org>,
 Dave Martin <Dave.Martin@....com>, David Hildenbrand <david@...hat.com>,
 Drew Fustini <dfustini@...libre.com>,
 D Scott Phillips <scott@...amperecomputing.com>,
 Fenghua Yu <fenghuay@...dia.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Hanjun Guo <guohanjun@...wei.com>, Jamie Iles <quic_jiles@...cinc.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, Koba Ko <kobak@...dia.com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Len Brown <lenb@...nel.org>,
 Linu Cherian <lcherian@...vell.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Peter Newman <peternewman@...gle.com>, "Rafael J. Wysocki"
 <rafael@...nel.org>, Rex Nie <rex.nie@...uarmicro.com>,
 Rob Herring <robh@...nel.org>, Rohit Mathew <rohit.mathew@....com>,
 Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
 Shanker Donthineni <sdonthineni@...dia.com>,
 Shaopeng Tan <tan.shaopeng@...itsu.com>, Sudeep Holla
 <sudeep.holla@....com>, Will Deacon <will@...nel.org>,
 Xin Hao <xhao@...ux.alibaba.com>
Subject: Re: [PATCH 10/33] arm_mpam: Add probe/remove for mpam msc driver and
 kbuild boiler plate

…
> +++ b/drivers/resctrl/mpam_devices.c
> @@ -0,0 +1,336 @@
…
> +static void mpam_msc_drv_remove(struct platform_device *pdev)
> +{
…
> +	mutex_lock(&mpam_list_lock);
> +	mpam_num_msc--;
…
> +	devm_kfree(&pdev->dev, msc);
> +	mutex_unlock(&mpam_list_lock);
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&mpam_list_lock);”?
https://elixir.bootlin.com/linux/v6.17-rc2/source/include/linux/mutex.h#L228

Regards,
Markus