diff options
| author | Puranjay Mohan <puranjay@kernel.org> | 2025-12-19 10:44:17 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-12-21 10:54:37 -0800 |
| commit | 93f0d09697613beba922a387d21a09a41eeefef5 (patch) | |
| tree | df90d42f04a277ea3aabcfcb623880bae9f2183b /include/linux/bpf.h | |
| parent | 3d60306b7bb4a3a3c5f01750a2303f987b7d93fa (diff) | |
bpf: move recursion detection logic to helpers
BPF programs detect recursion by doing atomic inc/dec on a per-cpu
active counter from the trampoline. Create two helpers for operations on
this active counter, this makes it easy to changes the recursion
detection logic in future.
This commit makes no functional changes.
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20251219184422.2899902-2-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/bpf.h')
| -rw-r--r-- | include/linux/bpf.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index bb3847caeae1..2da986136d26 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -2004,6 +2004,16 @@ struct bpf_struct_ops_common_value { enum bpf_struct_ops_state state; }; +static inline bool bpf_prog_get_recursion_context(struct bpf_prog *prog) +{ + return this_cpu_inc_return(*(prog->active)) == 1; +} + +static inline void bpf_prog_put_recursion_context(struct bpf_prog *prog) +{ + this_cpu_dec(*(prog->active)); +} + #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) /* This macro helps developer to register a struct_ops type and generate * type information correctly. Developers should use this macro to register |