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bpf: Prevent .BTF section elimination 

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: 90ceddcb49 ("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.1600417359.git.Tony.Ambardar@gmail.com
This commit is contained in:
Tony Ambardar 2020-09-19 22:01:34 -07:00 committed by Daniel Borkmann
parent e23bb04b0c
commit 65c2043989
1 changed files with 1 additions and 1 deletions
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2
include/asm-generic/vmlinux.lds.h
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@ -661,7 +661,7 @@
#define BTF \
.BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
__start_BTF = .; \
*(.BTF) \
KEEP(*(.BTF)) \
__stop_BTF = .; \
} \
. = ALIGN(4); \