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authorNathan Chancellor <nathan@kernel.org>2022-07-13 10:35:03 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2022-07-14 16:57:26 +0200
commit33f32e5072b6cc84d1b130a3ad485849bcec907a (patch)
treec2fbbeba0620fde9c734e3f7d479ab102ac506c3 /arch/arm64/net
parent94bf6aad5dbed1c93618035ec31b37927538c276 (diff)
bpf, arm64: Mark dummy_tramp as global
When building with clang + CONFIG_CFI_CLANG=y, the following error occurs at link time: ld.lld: error: undefined symbol: dummy_tramp dummy_tramp is declared globally in C but its definition in inline assembly does not use .global, which prevents clang from properly resolving the references to it when creating the CFI jump tables. Mark dummy_tramp as global so that the reference can be properly resolved. Fixes: b2ad54e1533e ("bpf, arm64: Implement bpf_arch_text_poke() for arm64") Suggested-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Stanislav Fomichev <sdf@google.com> Link: https://github.com/ClangBuiltLinux/linux/issues/1661 Link: https://lore.kernel.org/bpf/20220713173503.3889486-1-nathan@kernel.org
Diffstat (limited to 'arch/arm64/net')
-rw-r--r--arch/arm64/net/bpf_jit_comp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index fd1cb0d2aaa6..dcc572b7d4da 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -604,6 +604,7 @@ void dummy_tramp(void);
asm (
" .pushsection .text, \"ax\", @progbits\n"
+" .global dummy_tramp\n"
" .type dummy_tramp, %function\n"
"dummy_tramp:"
#if IS_ENABLED(CONFIG_ARM64_BTI_KERNEL)