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bpf: Extend bpf_base_func_proto helpers with bpf_get_current_task_btf()

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bpf_get_current_task() is already supported so it's natural to also
include the _btf() variant for btf-powered helpers.

This is required for non-tracing progs to use bpf_task_pt_regs() in the
next commit.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/f99870ed5f834c9803d73b3476f8272b1bb987c0.1629772842.git.dxu@dxuuu.xyz
This commit is contained in:
Daniel Xu 2021-08-23 19:43:48 -07:00 committed by Alexei Starovoitov
parent 33c5cb3601
commit a396eda551
2 changed files with 4 additions and 1 deletions
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3
kernel/bpf/helpers.c
View file

@ -1322,6 +1322,7 @@ void bpf_timer_cancel_and_free(void *val)
}
const struct bpf_func_proto bpf_get_current_task_proto __weak;
const struct bpf_func_proto bpf_get_current_task_btf_proto __weak;
const struct bpf_func_proto bpf_probe_read_user_proto __weak;
const struct bpf_func_proto bpf_probe_read_user_str_proto __weak;
const struct bpf_func_proto bpf_probe_read_kernel_proto __weak;
@ -1407,6 +1408,8 @@ bpf_base_func_proto(enum bpf_func_id func_id)
return bpf_get_trace_printk_proto();
case BPF_FUNC_get_current_task:
return &bpf_get_current_task_proto;
case BPF_FUNC_get_current_task_btf:
return &bpf_get_current_task_btf_proto;
case BPF_FUNC_probe_read_user:
return &bpf_probe_read_user_proto;
case BPF_FUNC_probe_read_kernel:

2
kernel/trace/bpf_trace.c
View file

@ -716,7 +716,7 @@ BPF_CALL_0(bpf_get_current_task_btf)
BTF_ID_LIST_GLOBAL_SINGLE(btf_task_struct_ids, struct, task_struct)
static const struct bpf_func_proto bpf_get_current_task_btf_proto = {
const struct bpf_func_proto bpf_get_current_task_btf_proto = {
.func = bpf_get_current_task_btf,
.gpl_only = true,
.ret_type = RET_PTR_TO_BTF_ID,