From: Larysa Zaremba <larysa.zaremba@xxxxxxxxx> Try to acquire vmlinux BTF the same way it's being done for module BTFs. Use btf_load_next_with_info() and resort to the filesystem lookup only if it fails. Also, adjust debug messages in btf__load_vmlinux_btf() to reflect that it actually tries to load vmlinux BTF. Signed-off-by: Larysa Zaremba <larysa.zaremba@xxxxxxxxx> Signed-off-by: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx> --- tools/lib/bpf/btf.c | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c index 7e4dbf71fd52..8ecd50923fab 100644 --- a/tools/lib/bpf/btf.c +++ b/tools/lib/bpf/btf.c @@ -4927,6 +4927,25 @@ struct btf *btf_load_next_with_info(__u32 start_id, struct bpf_btf_info *info, } } +static struct btf *btf_load_vmlinux_from_kernel(void) +{ + char name[BTF_NAME_BUF_LEN] = { }; + struct bpf_btf_info info; + struct btf *btf; + + memset(&info, 0, sizeof(info)); + info.name = ptr_to_u64(name); + info.name_len = sizeof(name); + + btf = btf_load_next_with_info(0, &info, NULL, true); + if (!libbpf_get_error(btf)) { + close(btf->fd); + btf__set_fd(btf, -1); + } + + return btf; +} + /* * Probe few well-known locations for vmlinux kernel image and try to load BTF * data out of it to use for target BTF. @@ -4953,6 +4972,15 @@ struct btf *btf__load_vmlinux_btf(void) struct btf *btf; int i, err; + btf = btf_load_vmlinux_from_kernel(); + err = libbpf_get_error(btf); + pr_debug("loading vmlinux BTF from kernel: %d\n", err); + if (!err) + return btf; + + pr_info("failed to load vmlinux BTF from kernel: %d, will look through filesystem\n", + err); + uname(&buf); for (i = 0; i < ARRAY_SIZE(locations); i++) { @@ -4966,14 +4994,14 @@ struct btf *btf__load_vmlinux_btf(void) else btf = btf__parse_elf(path, NULL); err = libbpf_get_error(btf); - pr_debug("loading kernel BTF '%s': %d\n", path, err); + pr_debug("loading vmlinux BTF '%s': %d\n", path, err); if (err) continue; return btf; } - pr_warn("failed to find valid kernel BTF\n"); + pr_warn("failed to find valid vmlinux BTF\n"); return libbpf_err_ptr(-ESRCH); } -- 2.36.1