linux-kernel - Re: [PATCH v3 0/4] drm: Use full allocated minor range for DRM

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Message-ID: <YxdXZbFBHIevYwRz@casper.infradead.org>
Date:   Tue, 6 Sep 2022 15:21:25 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Michał Winiarski <michal.winiarski@...el.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Simon Ser <contact@...rsion.fr>
Subject: Re: [PATCH v3 0/4] drm: Use full allocated minor range for DRM

On Tue, Sep 06, 2022 at 04:01:13PM +0200, Michał Winiarski wrote:
> 64 DRM device nodes is not enough for everyone.
> Upgrade it to ~512K (which definitely is more than enough).
> 
> To allow testing userspace support for >64 devices, add additional DRM
> modparam (skip_legacy_minors) which causes DRM to skip allocating minors
> in 0-192 range.
> Additionally - one minor tweak around minor DRM IDR locking and IDR lockdep
> annotations.

The IDR is deprecated; rather than making all these changes around
the IDR, could you convert it to use the XArray instead?  I did it
once before, but those patches bounced off the submissions process.