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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
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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6
drivers/gpu/drm/tests/drm_gem_shmem_test.c
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@@ -168,7 +168,7 @@ static void drm_gem_shmem_test_vmap(struct kunit *test)
shmem = drm_gem_shmem_create(drm_dev, TEST_SIZE);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem);
KUNIT_EXPECT_NULL(test, shmem->vaddr);
KUNIT_EXPECT_EQ(test, shmem->vmap_use_count, 0);
KUNIT_EXPECT_EQ(test, refcount_read(&shmem->vmap_use_count), 0);
ret = kunit_add_action_or_reset(test, drm_gem_shmem_free_wrapper, shmem);
KUNIT_ASSERT_EQ(test, ret, 0);
@@ -177,7 +177,7 @@ static void drm_gem_shmem_test_vmap(struct kunit *test)
KUNIT_ASSERT_EQ(test, ret, 0);
KUNIT_ASSERT_NOT_NULL(test, shmem->vaddr);
KUNIT_ASSERT_FALSE(test, iosys_map_is_null(&map));
KUNIT_EXPECT_EQ(test, shmem->vmap_use_count, 1);
KUNIT_EXPECT_EQ(test, refcount_read(&shmem->vmap_use_count), 1);
iosys_map_memset(&map, 0, TEST_BYTE, TEST_SIZE);
for (i = 0; i < TEST_SIZE; i++)
@@ -185,7 +185,7 @@ static void drm_gem_shmem_test_vmap(struct kunit *test)
drm_gem_shmem_vunmap_locked(shmem, &map);
KUNIT_EXPECT_NULL(test, shmem->vaddr);
KUNIT_EXPECT_EQ(test, shmem->vmap_use_count, 0);
KUNIT_EXPECT_EQ(test, refcount_read(&shmem->vmap_use_count), 0);
}
/*