The .orc_unwind section is a packed array of 6-byte structs. It's currently aligned to 6 bytes, which is causing warnings in the LLD linker.
Six isn't a power of two, so it's not a valid alignment value. The actual alignment doesn't matter much because it's an array of packed structs. An alignment of two is sufficient. In reality it always gets aligned to four bytes because it comes immediately after the 4-byte-aligned .orc_unwind_ip section. Link: https://github.com/ClangBuiltLinux/linux/issues/218 Fixes: ee9f8fce9964 ("x86/unwind: Add the ORC unwinder") Reported-by: Nick Desaulniers <ndesaulni...@google.com> Reported-by: Dmitry Golovin <d...@golovin.in> Reported-by: Sedat Dilek <sedat.di...@gmail.com> Tested-by: Sedat Dilek <sedat.di...@gmail.com> Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com> --- include/asm-generic/vmlinux.lds.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 3d7a6a9c2370..f8f6f04c4453 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -733,7 +733,7 @@ KEEP(*(.orc_unwind_ip)) \ __stop_orc_unwind_ip = .; \ } \ - . = ALIGN(6); \ + . = ALIGN(2); \ .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ __start_orc_unwind = .; \ KEEP(*(.orc_unwind)) \ -- 2.17.2