linux-kernel - Re: [PATCH v16 15/20] drm/shmem-helper: Add memory shrinker

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Message-ID: <20230914153041.569f39bb@collabora.com>
Date:   Thu, 14 Sep 2023 15:30:41 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     David Airlie <airlied@...il.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Christian König <christian.koenig@....com>,
        Qiang Yu <yuq825@...il.com>,
        Steven Price <steven.price@....com>,
        Emma Anholt <emma@...olt.net>, Melissa Wen <mwen@...lia.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v16 15/20] drm/shmem-helper: Add memory shrinker

On Thu, 14 Sep 2023 15:27:03 +0200
Boris Brezillon <boris.brezillon@...labora.com> wrote:

> You should drop the '&& refcount_read(&shmem->pages_use_count)',
> otherwise you'll never enter this branch (sgt allocation retained
> a ref, so pages_use_count > 0 when ->sgt != NULL).

Sorry for the brain fart. You can drop this extra test because its
redundant (->sgt != NULL implies pages_use_count > 0), but it shouldn't
prevent you from entering the branch.