diff mbox series

[bpf-next,2/4] selftests/bpf: Add check_lto_kernel() helper

Message ID 20240302165027.1628051-1-yonghong.song@linux.dev (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series selftests/bpf: Fix a couple of test failures with LTO kernel | expand

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bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
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netdev/cc_maintainers warning 11 maintainers not CCed: jolsa@kernel.org mykolal@fb.com john.fastabend@gmail.com martin.lau@linux.dev song@kernel.org shuah@kernel.org sdf@google.com linux-kselftest@vger.kernel.org eddyz87@gmail.com kpsingh@kernel.org haoluo@google.com
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netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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Commit Message

Yonghong Song March 2, 2024, 4:50 p.m. UTC 
Add check_lto_kernel() helper to detect whether the underlying kernel
enabled CONFIG_LTO or not. The function check_lto_kernel() can be
used by selftests to handle some lto-specific situations.

The code is heavily borrowed from libbpf function
bpf_object__read_kconfig_file().

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
---
 tools/testing/selftests/bpf/testing_helpers.c | 47 +++++++++++++++++++
 tools/testing/selftests/bpf/testing_helpers.h |  1 +
 2 files changed, 48 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/testing_helpers.c b/tools/testing/selftests/bpf/testing_helpers.c
index 28b6646662af..3f74f73843cf 100644
--- a/tools/testing/selftests/bpf/testing_helpers.c
+++ b/tools/testing/selftests/bpf/testing_helpers.c
@@ -5,6 +5,8 @@ 
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <zlib.h>
+#include <sys/utsname.h>
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 #include "test_progs.h"
@@ -475,3 +477,48 @@  bool is_jit_enabled(void)
 
 	return enabled;
 }
+
+int check_lto_kernel(void)
+{
+	static int check_lto = 2;
+	char buf[PATH_MAX];
+	struct utsname uts;
+	gzFile file;
+	int len;
+
+	if (check_lto != 2)
+		return check_lto;
+
+	uname(&uts);
+	len = snprintf(buf, PATH_MAX, "/boot/config-%s", uts.release);
+	if (len < 0) {
+		check_lto = -EINVAL;
+		goto out;
+	} else if (len >= PATH_MAX) {
+		check_lto = -ENAMETOOLONG;
+		goto out;
+	}
+
+	/* gzopen also accepts uncompressed files. */
+	file = gzopen(buf, "re");
+	if (!file)
+		file = gzopen("/proc/config.gz", "re");
+
+	if (!file) {
+		check_lto = -ENOENT;
+		goto out;
+	}
+
+	check_lto = 0;
+	while (gzgets(file, buf, sizeof(buf))) {
+		/* buf also contains '\n', skip it during comparison. */
+		if (!strncmp(buf, "CONFIG_LTO=y", 12)) {
+			check_lto = 1;
+			break;
+		}
+	}
+
+	gzclose(file);
+out:
+	return check_lto;
+}
diff --git a/tools/testing/selftests/bpf/testing_helpers.h b/tools/testing/selftests/bpf/testing_helpers.h
index d55f6ab12433..57683b3a1280 100644
--- a/tools/testing/selftests/bpf/testing_helpers.h
+++ b/tools/testing/selftests/bpf/testing_helpers.h
@@ -55,5 +55,6 @@  struct bpf_insn;
 int get_xlated_program(int fd_prog, struct bpf_insn **buf, __u32 *cnt);
 int testing_prog_flags(void);
 bool is_jit_enabled(void);
+int check_lto_kernel(void);
 
 #endif /* __TESTING_HELPERS_H */