Merge branch 'bpf-retire-the-unsupported_ops-usage-in-struct_ops'

Martin KaFai Lau says:

====================
bpf: Retire the unsupported_ops usage in struct_ops

From: Martin KaFai Lau <martin.lau@kernel.org>

This series retires the unsupported_ops usage and depends on the
null-ness check on the cfi_stubs instead.

Please see individual patches for details.

v2:
- Fixed a gcc compiler warning on Patch 1.
====================

Link: https://lore.kernel.org/r/20240722183049.2254692-1-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index bb3eabc0dc769..fda3dd2ee9844 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -1040,6 +1040,13 @@ void bpf_struct_ops_put(const void *kdata)
 	bpf_map_put(&st_map->map);
 }
 
+int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff)
+{
+	void *func_ptr = *(void **)(st_ops->cfi_stubs + moff);
+
+	return func_ptr ? 0 : -ENOTSUPP;
+}
+
 static bool bpf_struct_ops_valid_to_reg(struct bpf_map *map)
 {
 	struct bpf_struct_ops_map *st_map = (struct bpf_struct_ops_map *)map;