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bpf: Export necessary symbols for modules with struct_ops 

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>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20251107035632.115950-2-alibuda@linux.alibaba.com
This commit is contained in:
D. Wythe 2025-11-07 11:56:30 +08:00 committed by Martin KaFai Lau
parent abd0c0f6aa
commit 07c428ece3
2 changed files with 3 additions and 0 deletions
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2
kernel/bpf/bpf_struct_ops.c
View File

@ -1162,6 +1162,7 @@ bool bpf_struct_ops_get(const void *kdata)
map = __bpf_map_inc_not_zero(&st_map->map, false); map = __bpf_map_inc_not_zero(&st_map->map, false);
return !IS_ERR(map); return !IS_ERR(map);
} }
EXPORT_SYMBOL_GPL(bpf_struct_ops_get);
void bpf_struct_ops_put(const void *kdata) void bpf_struct_ops_put(const void *kdata)
{ {
@ -1173,6 +1174,7 @@ void bpf_struct_ops_put(const void *kdata)
bpf_map_put(&st_map->map); bpf_map_put(&st_map->map);
} }
EXPORT_SYMBOL_GPL(bpf_struct_ops_put);
u32 bpf_struct_ops_id(const void *kdata) u32 bpf_struct_ops_id(const void *kdata)
{ {

1
kernel/bpf/syscall.c
View File

@ -1234,6 +1234,7 @@ int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size)
return src - orig_src; return src - orig_src;
} }
EXPORT_SYMBOL_GPL(bpf_obj_name_cpy);
int map_check_no_btf(const struct bpf_map *map, int map_check_no_btf(const struct bpf_map *map,
const struct btf *btf, const struct btf *btf,