From: Tony Ambardar tony.ambardar@gmail.com
commit 65c204398928f9c79f1a29912b410439f7052635 upstream.
Systems with memory or disk constraints often reduce the kernel footprint by configuring LD_DEAD_CODE_DATA_ELIMINATION. However, this can result in removal of any BTF information.
Use the KEEP() macro to preserve the BTF data as done with other important sections, while still allowing for smaller kernels.
Fixes: 90ceddcb4950 ("bpf: Support llvm-objcopy for vmlinux BTF") Signed-off-by: Tony Ambardar Tony.Ambardar@gmail.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Acked-by: John Fastabend john.fastabend@gmail.com Acked-by: Andrii Nakryiko andriin@fb.com Link: https://lore.kernel.org/bpf/a635b5d3e2da044e7b51ec1315e8910fbce0083f.1600417... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/asm-generic/vmlinux.lds.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -641,7 +641,7 @@ #define BTF \ .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ __start_BTF = .; \ - *(.BTF) \ + KEEP(*(.BTF)) \ __stop_BTF = .; \ } #else