While building of vmlinux employs a linker script to align the .BTF_ids
section to 4 bytes, other usage leaves .BTF_ids unaligned and may lead to
problems (e.g. [1]). Post-processing and libelf-based endian translation by
resolve_btfids may also potentially suffer from misalignment.
Update encoding macros in btf_ids.h to always align BTF ID data to 4 bytes.
[1]: 3effc06a4dde ("selftests/bpf: Fix alignment of .BTF_ids")
Signed-off-by: Tony Ambardar <tony.ambardar@xxxxxxxxx>
---
include/linux/btf_ids.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
index c0e3e1426a82..c10b163dc340 100644
--- a/include/linux/btf_ids.h
+++ b/include/linux/btf_ids.h
@@ -89,6 +89,7 @@ word \
#define __BTF_ID_LIST(name, scope) \
asm( \
".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
+".balign 4, 0; \n" \
"." #scope " " #name "; \n" \
#name ":; \n" \
".popsection; \n");
--
2.34.1
