linux-kernel - Re: [PATCH drm-next 1/2] vmalloc: Add atomic

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Message-ID: <851bef96-245b-4f5c-8390-ab94dbc04063@web.de>
Date: Wed, 5 Mar 2025 18:08:57 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Ryosuke Yasuoka <ryasuoka@...hat.com>, dri-devel@...ts.freedesktop.org,
 linux-mm@...ck.org, virtualization@...ts.linux.dev,
 Andrew Morton <akpm@...ux-foundation.org>, Chia-I Wu <olvaffe@...il.com>,
 Christoph Hellwig <hch@...radead.org>,
 Dmitry Osipenko <dmitry.osipenko@...labora.com>,
 David Airlie <airlied@...il.com>, Gerd Hoffmann <kraxel@...hat.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>,
 Jocelyn Falempe <jfalempe@...hat.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Simona Vetter <simona@...ll.ch>,
 Thomas Zimmermann <tzimmermann@...e.de>, Uladzislau Rezki <urezki@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH drm-next 1/2] vmalloc: Add atomic_vmap

> Some drivers can use vmap in drm_panic, however, vmap is sleepable and
> takes locks. Since drm_panic will vmap in panic handler, atomic_vmap
> requests pages with GFP_ATOMIC and maps KVA without locks and sleep.

See also:
https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.14-rc5#n94

Regards,
Markus