[PATCH bpf-next v3 1/5] bpf: export necessary sympols for modules with struct_ops

D. Wythe
2024-12-18T02:44:31Z

Exports three necessary symbols for implementing struct_ops with
tristate subsystem.

To hold or release refcnt of struct_ops refcnt by inline funcs
bpf_try_module_get and bpf_module_put which use bpf_struct_ops_get(put)
conditionally.

And to copy obj name from one to the other with effective checks by
bpf_obj_name_cpy.

Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
---
kernel/bpf/bpf_struct_ops.c | 2 ++
kernel/bpf/syscall.c | 1 +
2 files changed, 3 insertions(+)

diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index 606efe32485a..00c212e0ad39 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -1119,6 +1119,7 @@ bool bpf_struct_ops_get(const void *kdata)
map = __bpf_map_inc_not_zero(&st_map->map, false);
return !IS_ERR(map);
}
+EXPORT_SYMBOL_GPL(bpf_struct_ops_get);

void bpf_struct_ops_put(const void *kdata)
{
@@ -1130,6 +1131,7 @@ void bpf_struct_ops_put(const void *kdata)

bpf_map_put(&st_map->map);
}
+EXPORT_SYMBOL_GPL(bpf_struct_ops_put);

int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff)
{
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 5684e8ce132d..62238ec989dc 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1167,6 +1167,7 @@ int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size)

return src - orig_src;
}
+EXPORT_SYMBOL_GPL(bpf_obj_name_cpy);

int map_check_no_btf(const struct bpf_map *map,
const struct btf *btf,
--
2.45.0