drm/shmem-helper: Use refcount_t for vmap_use_count

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Use refcount_t helper for vmap_use_count to make refcounting consistent
with pages_use_count and pages_pin_count that use refcount_t. This also
makes vmapping to benefit from the refcount_t's overflow checks.

Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Suggested-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.d>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250322212608.40511-11-dmitry.osipenko@collabora.com

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This commit is contained in:

Dmitry Osipenko 2025-03-23 00:26:08 +03:00

parent 0271cc484f

commit e1fc39a923

3 changed files with 16 additions and 20 deletions

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28

drivers/gpu/drm/drm_gem_shmem_helper.c

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6

drivers/gpu/drm/tests/drm_gem_shmem_test.c

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2

include/drm/drm_gem_shmem_helper.h

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