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| author |   Yonghong Song <yhs@fb.com> | 2020-07-20 09:33:58 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-07-21 13:26:26 -0700 |
| commit | bc4f0548f683a3d53359cef15f088d2d5bb4bc39 (patch) | |
| tree | f2537b237c573ed4d8316b26adeee72e0b0a4b65 /kernel/bpf/btf.c | |
| parent | samples/bpf, selftests/bpf: Use bpf_probe_read_kernel (diff) | |
| download | linux-dev-bc4f0548f683a3d53359cef15f088d2d5bb4bc39.tar.xz linux-dev-bc4f0548f683a3d53359cef15f088d2d5bb4bc39.zip | |
bpf: Compute bpf_skc_to_*() helper socket btf ids at build time
Currently, socket types (struct tcp_sock, udp_sock, etc.)
used by bpf_skc_to_*() helpers are computed when vmlinux_btf
is first built in the kernel.
Commit 5a2798ab32ba
("bpf: Add BTF_ID_LIST/BTF_ID/BTF_ID_UNUSED macros")
implemented a mechanism to compute btf_ids at kernel build
time which can simplify kernel implementation and reduce
runtime overhead by removing in-kernel btf_id calculation.
This patch did exactly this, removing in-kernel btf_id
computation and utilizing build-time btf_id computation.
If CONFIG_DEBUG_INFO_BTF is not defined, BTF_ID_LIST will
define an array with size of 5, which is not enough for
btf_sock_ids. So define its own static array if
CONFIG_DEBUG_INFO_BTF is not defined.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200720163358.1393023-1-yhs@fb.com
Diffstat (limited to 'kernel/bpf/btf.c')
| -rw-r--r-- | kernel/bpf/btf.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 03d6d43bb1d6..315cde73421b 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -3672,7 +3672,6 @@ struct btf *btf_parse_vmlinux(void) goto errout; bpf_struct_ops_init(btf, log); - init_btf_sock_ids(btf); btf_verifier_env_free(env); refcount_set(&btf->refcnt, 1); |