linux-kernel - Re: [PATCH v6 1/4] drm: Use XArray instead of IDR for minors

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Date:   Tue, 29 Aug 2023 14:35:34 -0400
From:   James Zhu <jamesz@....com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Michał Winiarski <michal.winiarski@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        intel-gfx@...ts.freedesktop.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>,
        Oded Gabbay <ogabbay@...nel.org>,
        Christian König <christian.koenig@....com>,
        James Zhu <James.Zhu@....com>,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        Emil Velikov <emil.l.velikov@...il.com>
Subject: Re: [PATCH v6 1/4] drm: Use XArray instead of IDR for minors


On 2023-08-29 14:33, Matthew Wilcox wrote:
> On Tue, Aug 29, 2023 at 01:34:22PM -0400, James Zhu wrote:
>>>>> @@ -1067,7 +1055,7 @@ static void drm_core_exit(void)
>>>>>     	unregister_chrdev(DRM_MAJOR, "drm");
>>>>>     	debugfs_remove(drm_debugfs_root);
>>>>>     	drm_sysfs_destroy();
>>>>> -	idr_destroy(&drm_minors_idr);
>>>> [JZ] Should we call xa_destroy instead here?
>>> We could, if we expect the xarray to potentially not be empty.
>>>   From what I understand - all minors should be released at this point.
>> [JZ] In practice,  adding destroy here will be better.
> Why do you say that?
[JZ] In case, the future, INIT adds something, need DESTROY to free 
completely.