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Date:   Wed, 4 Aug 2021 19:08:06 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Dan Williams <dan.j.williams@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
        linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH v1] driver: base: Add driver filter support
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On Wed, Aug 04, 2021 at 10:43:22AM -0700, Kuppuswamy Sathyanarayanan wrote:
> +/* Driver allow list */
> +static LIST_HEAD(driver_allow_list);
> +/* Driver deny list */
> +static LIST_HEAD(driver_deny_list);

Why use a doubly-linked-list here?  An allocating xarray should perform
much better and use less memory.