[PATCH bpf-next v1 1/3] bpf: Extract bpf_get_linfo_file_line

Kumar Kartikeya Dwivedi
2026-03-29T21:25:39Z

Extract bpf_get_linfo_file_line as its own function so that the logic to
obtain the file, line, and line number for a given program can be shared
in subsequent patches.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
include/linux/bpf.h | 2 ++
kernel/bpf/core.c | 32 +++++++++++++++++++++++---------
2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 05b34a6355b0..2c4f92085d79 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -3946,6 +3946,8 @@ static inline bool bpf_is_subprog(const struct bpf_prog *prog)
return prog->aux->func_idx != 0;
}

+int bpf_get_linfo_file_line(struct btf *btf, const struct bpf_line_info *linfo,
+ const char **filep, const char **linep, int *nump);
int bpf_prog_get_file_line(struct bpf_prog *prog, unsigned long ip, const char **filep,
const char **linep, int *nump);
struct bpf_prog *bpf_prog_find_from_stack(void);
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 1af5fb3f21d9..052dd78a2d81 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -3313,6 +3313,28 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(xdp_bulk_tx);

#ifdef CONFIG_BPF_SYSCALL

+int bpf_get_linfo_file_line(struct btf *btf, const struct bpf_line_info *linfo,
+ const char **filep, const char **linep, int *nump)
+{
+ /* Get base component of the file path. */
+ if (filep) {
+ *filep = btf_name_by_offset(btf, linfo->file_name_off);
+ *filep = kbasename(*filep);
+ }
+
+ /* Obtain the source line, and strip whitespace in prefix. */
+ if (linep) {
+ *linep = btf_name_by_offset(btf, linfo->line_off);
+ while (isspace(**linep))
+ *linep += 1;
+ }
+
+ if (nump)
+ *nump = BPF_LINE_INFO_LINE_NUM(linfo->line_col);
+
+ return 0;
+}
+
int bpf_prog_get_file_line(struct bpf_prog *prog, unsigned long ip, const char **filep,
const char **linep, int *nump)
{
@@ -3347,15 +3369,7 @@ int bpf_prog_get_file_line(struct bpf_prog *prog, unsigned long ip, const char *
if (idx == -1)
return -ENOENT;

- /* Get base component of the file path. */
- *filep = btf_name_by_offset(btf, linfo[idx].file_name_off);
- *filep = kbasename(*filep);
- /* Obtain the source line, and strip whitespace in prefix. */
- *linep = btf_name_by_offset(btf, linfo[idx].line_off);
- while (isspace(**linep))
- *linep += 1;
- *nump = BPF_LINE_INFO_LINE_NUM(linfo[idx].line_col);
- return 0;
+ return bpf_get_linfo_file_line(btf, &linfo[idx], filep, linep, nump);
}

struct walk_stack_ctx {
--
2.52.0