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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>
master
Menglong Dong 2026-01-20 15:05:54 +08:00 committed by Alexei Starovoitov
parent 83c9030cdc
commit eaedea154e
1 changed files with 22 additions and 0 deletions
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22
kernel/bpf/verifier.c
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@ -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)&current_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 &&