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.

Alexei Starovoitov committed 6 years ago

Commit b91e0141 parent 5b79bcd2 files · +59 −6Browse files

Showing the changes to include/linux (1 of 2 files). Show all

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include/linux/bpf.h+1−0

@@ -461,6 +461,7 @@ struct bpf_trampoline { · 460 unmodified lines
461	struct {	461	struct {
462	struct btf_func_model model;	462	struct btf_func_model model;
463	void *addr;	463	void *addr;
		464	bool ftrace_managed;
464	} func;	465	} func;
465	/* list of BPF programs using this trampoline */	466	/* list of BPF programs using this trampoline */
466	struct hlist_head progs_hlist[BPF_TRAMP_MAX];	467	struct hlist_head progs_hlist[BPF_TRAMP_MAX];

bpf: Make BPF trampoline use register_ftrace_direct() API

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