bpf: Preserve source attribution without source text

GCC emits BTF line records with a file name and line number, but leaves the
source line string empty. bpf_diag_source() currently treats that empty string
as if the complete line record were unavailable, so diagnostics fall back to
an instruction number and discard the function, file, and line attribution.

Print the available source location before deciding whether source context can
be rendered. When source text is absent, omit only the source context and retain
the diagnostic annotation and instruction context.

Fixes: b9c5d822f677 ("bpf: Add source and instruction diagnostic context")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20260816015746.2632990-12-memxor@gmail.com

0 files changed, 0 insertions, 0 deletions