diff options
| author | Menglong Dong <menglong8.dong@gmail.com> | 2026-01-20 15:05:54 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-01-20 20:39:01 -0800 |
| commit | eaedea154eb96b2f4ba8ec8e4397dab10758a705 (patch) | |
| tree | e489082ed52c636b882ad628ebee526214f233ae | |
| parent | 83c9030cdc45e0518d71065c25201a24eafc9818 (diff) | |
bpf, x86: inline bpf_get_current_task() for x86_64
Inline bpf_get_current_task() and bpf_get_current_task_btf() for x86_64
to obtain better performance.
Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260120070555.233486-2-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | kernel/bpf/verifier.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index bca0ca82d164..9905ad40f4d3 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -18130,6 +18130,10 @@ static bool verifier_inlines_helper_call(struct bpf_verifier_env *env, s32 imm) switch (imm) { #ifdef CONFIG_X86_64 case BPF_FUNC_get_smp_processor_id: +#ifdef CONFIG_SMP + case BPF_FUNC_get_current_task_btf: + case BPF_FUNC_get_current_task: +#endif return env->prog->jit_requested && bpf_jit_supports_percpu_insn(); #endif default: @@ -23715,6 +23719,24 @@ patch_map_ops_generic: insn = new_prog->insnsi + i + delta; goto next_insn; } + + /* Implement bpf_get_current_task() and bpf_get_current_task_btf() inline. */ + if ((insn->imm == BPF_FUNC_get_current_task || insn->imm == BPF_FUNC_get_current_task_btf) && + verifier_inlines_helper_call(env, insn->imm)) { + insn_buf[0] = BPF_MOV64_IMM(BPF_REG_0, (u32)(unsigned long)¤t_task); + insn_buf[1] = BPF_MOV64_PERCPU_REG(BPF_REG_0, BPF_REG_0); + insn_buf[2] = BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0); + cnt = 3; + + new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); + if (!new_prog) + return -ENOMEM; + + delta += cnt - 1; + env->prog = prog = new_prog; + insn = new_prog->insnsi + i + delta; + goto next_insn; + } #endif /* Implement bpf_get_func_arg inline. */ if (prog_type == BPF_PROG_TYPE_TRACING && |