linux-kernel - [PATCH v2] libbpf: Support raw btf placed in the default path

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Message-Id: <3f59fb5a345d2e4f10e16fe9e35fbc4c03ecaa3e.1662999860.git.chentao.kernel@linux.alibaba.com>
Date:   Tue, 13 Sep 2022 00:43:00 +0800
From:   Tao Chen <chentao.kernel@...ux.alibaba.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Tao Chen <chentao.kernel@...ux.alibaba.com>
Subject: [PATCH v2] libbpf: Support raw btf placed in the default path

Now only elf btf can be placed in the default path(/boot), raw
btf should also can be there.

Signed-off-by: Tao Chen <chentao.kernel@...ux.alibaba.com>
---
v2->v1: Remove the locations[i].raw_btf check
---
 tools/lib/bpf/btf.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index bb1e06e..46ec244 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -4657,11 +4657,10 @@ struct btf *btf__load_vmlinux_btf(void)
 {
 	struct {
 		const char *path_fmt;
-		bool raw_btf;
 	} locations[] = {
 		/* try canonical vmlinux BTF through sysfs first */
-		{ "/sys/kernel/btf/vmlinux", true /* raw BTF */ },
-		/* fall back to trying to find vmlinux ELF on disk otherwise */
+		{ "/sys/kernel/btf/vmlinux" },
+		/* fall back to trying to find vmlinux on disk otherwise */
 		{ "/boot/vmlinux-%1$s" },
 		{ "/lib/modules/%1$s/vmlinux-%1$s" },
 		{ "/lib/modules/%1$s/build/vmlinux" },
@@ -4683,10 +4682,7 @@ struct btf *btf__load_vmlinux_btf(void)
 		if (access(path, R_OK))
 			continue;
 
-		if (locations[i].raw_btf)
-			btf = btf__parse_raw(path);
-		else
-			btf = btf__parse_elf(path, NULL);
+		btf = btf__parse(path, NULL);
 		err = libbpf_get_error(btf);
 		pr_debug("loading kernel BTF '%s': %d\n", path, err);
 		if (err)
-- 
2.2.1