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, 16 insertions, 0 deletions

diff --git a/tools/testing/memblock/mmzone.c b/tools/testing/memblock/mmzone.c
new file mode 100644
index 000000000..e719450f8
--- /dev/null
+++ b/tools/testing/memblock/mmzone.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/mmzone.h>
+
+struct pglist_data *first_online_pgdat(void)
+{
+	return NULL;
+}
+
+struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
+{
+	return NULL;
+}
+
+void atomic_long_set(atomic_long_t *v, long i)
+{
+}