Unverified Commit 47687a29 authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by Kumar Kartikeya Dwivedi
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selftests/bpf: Use memfd_create instead of shm_open in cgroup_iter_memcg 



Replace shm_open/shm_unlink with memfd_create in the shmem subtest.
shm_open requires /dev/shm to be mounted, which is not always available
in test environments, causing the test to fail with ENOENT.
memfd_create creates an anonymous shmem-backed fd without any filesystem
dependency while exercising the same shmem accounting path.

Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20260412210636.47516-1-alexei.starovoitov@gmail.com


Signed-off-by: default avatarKumar Kartikeya Dwivedi <memxor@gmail.com>
parent fa294291

tools/testing/selftests/bpf/prog_tests/cgroup_iter_memcg.c

+3 −4
Original line number Diff line number Diff line
@@ -107,10 +107,10 @@ static void test_shmem(struct bpf_link *link, struct memcg_query *memcg_query) 


	/*

	 * Increase memcg shmem usage by creating and writing

	 * to a shmem object.

	 * to a memfd backed by shmem/tmpfs.

	 */

	fd = shm_open("/tmp_shmem", O_CREAT | O_RDWR, 0644);

	if (!ASSERT_OK_FD(fd, "shm_open"))

	fd = memfd_create("tmp_shmem", 0);

	if (!ASSERT_OK_FD(fd, "memfd_create"))

		return;



	if (!ASSERT_OK(fallocate(fd, 0, 0, len), "fallocate"))
@@ -123,7 +123,6 @@ static void test_shmem(struct bpf_link *link, struct memcg_query *memcg_query) 


cleanup:

	close(fd);

	shm_unlink("/tmp_shmem");

}



static void test_pgfault(struct bpf_link *link, struct memcg_query *memcg_query)