bpf: Make BPF trampoline use register_ftrace_direct() API
Make BPF trampoline attach its generated assembly code to kernel functions via
register_ftrace_direct() API. It helps ftrace-based tracers co-exist with BPF
trampoline on the same kernel function. It also switches attaching logic from
arch specific text_poke to generic ftrace that is available on many
architectures. text_poke is still necessary for bpf-to-bpf attach and for
bpf_tail_call optimization.
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 35903f1..ac7de52 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -461,6 +461,7 @@ struct bpf_trampoline {
struct {
struct btf_func_model model;
void *addr;
+ bool ftrace_managed;
} func;
/* list of BPF programs using this trampoline */
struct hlist_head progs_hlist[BPF_TRAMP_MAX];
