selftests/bpf: Add a test for objects stuck in free_by_rcu_ttracegrafted

Delete all elements of BPF_F_NO_PREALLOC hash map in one batch. The first
free_bulk() starts RCU tasks trace GP and the rest of the elements are
freed while it's in flight. Wait for call_rcu_ttrace_in_progress to clear
in bpf_mem_cache of every cpu and check that free_by_rcu_ttrace and
waiting_for_gp_ttrace lists are empty.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20260930095920.601738-4-alexei.starovoitov@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/rust/helpers/drm_gpuvm.c b/rust/helpers/drm_gpuvm.c
new file mode 100644
index 000000000..4130b6325
--- /dev/null
+++ b/rust/helpers/drm_gpuvm.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+
+#ifdef CONFIG_RUST_DRM_GPUVM
+
+#include <drm/drm_gpuvm.h>
+
+__rust_helper
+struct drm_gpuvm_bo *rust_helper_drm_gpuvm_bo_get(struct drm_gpuvm_bo *vm_bo)
+{
+	return drm_gpuvm_bo_get(vm_bo);
+}
+
+__rust_helper
+struct drm_gpuvm *rust_helper_drm_gpuvm_get(struct drm_gpuvm *obj)
+{
+	return drm_gpuvm_get(obj);
+}
+
+__rust_helper
+bool rust_helper_drm_gpuvm_is_extobj(struct drm_gpuvm *gpuvm,
+				     struct drm_gem_object *obj)
+{
+	return drm_gpuvm_is_extobj(gpuvm, obj);
+}
+
+#endif // CONFIG_RUST_DRM_GPUVM