linux-kernel - [PATCH 5.10 02/43] bpf: Fix selftest compilation on clang 11

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Message-Id: <20210122135735.742795244@linuxfoundation.org>
Date:   Fri, 22 Jan 2021 15:12:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrei Matei <andreimatei1@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Florian Lehner <dev@...-flo.net>, Yonghong Song <yhs@...com>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: [PATCH 5.10 02/43] bpf: Fix selftest compilation on clang 11

From: Andrei Matei <andreimatei1@...il.com>

commit fb3558127cb62ba2dea9e3d0efa1bb1d7e5eee2a upstream.

Before this patch, profiler.inc.h wouldn't compile with clang-11 (before
the __builtin_preserve_enum_value LLVM builtin was introduced in
https://reviews.llvm.org/D83242).

Another test that uses this builtin (test_core_enumval) is conditionally
skipped if the compiler is too old. In that spirit, this patch inhibits
part of populate_cgroup_info(), which needs this CO-RE builtin. The
selftests build again on clang-11.

The affected test (the profiler test) doesn't pass on clang-11 because
it's missing https://reviews.llvm.org/D85570, but at least the test suite
as a whole compiles. The test's expected failure is already called out in
the README.

Signed-off-by: Andrei Matei <andreimatei1@...il.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Tested-by: Florian Lehner <dev@...-flo.net>
Acked-by: Yonghong Song <yhs@...com>
Link: https://lore.kernel.org/bpf/20201125035255.17970-1-andreimatei1@gmail.com
Cc: Lorenz Bauer <lmb@...udflare.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 tools/testing/selftests/bpf/progs/profiler.inc.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/tools/testing/selftests/bpf/progs/profiler.inc.h
+++ b/tools/testing/selftests/bpf/progs/profiler.inc.h
@@ -256,6 +256,7 @@ static INLINE void* populate_cgroup_info
 		BPF_CORE_READ(task, nsproxy, cgroup_ns, root_cset, dfl_cgrp, kn);
 	struct kernfs_node* proc_kernfs = BPF_CORE_READ(task, cgroups, dfl_cgrp, kn);
 
+#if __has_builtin(__builtin_preserve_enum_value)
 	if (ENABLE_CGROUP_V1_RESOLVER && CONFIG_CGROUP_PIDS) {
 		int cgrp_id = bpf_core_enum_value(enum cgroup_subsys_id___local,
 						  pids_cgrp_id___local);
@@ -275,6 +276,7 @@ static INLINE void* populate_cgroup_info
 			}
 		}
 	}
+#endif
 
 	cgroup_data->cgroup_root_inode = get_inode_from_kernfs(root_kernfs);
 	cgroup_data->cgroup_proc_inode = get_inode_from_kernfs(proc_kernfs);