Messages in this thread Patch in this message | | | Date | Fri, 15 Sep 2023 10:34:28 -0700 | Subject | [PATCH bpf v3 2/2] bpf: Fix BTF_ID symbol generation collision in tools/ | From | Nick Desaulniers <> |
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Marcus and Satya reported an issue where BTF_ID macro generates same symbol in separate objects and that breaks final vmlinux link.
ld.lld: error: ld-temp.o <inline asm>:14577:1: symbol '__BTF_ID__struct__cgroup__624' is already defined
This can be triggered under specific configs when __COUNTER__ happens to be the same for the same symbol in two different translation units, which is already quite unlikely to happen.
Add __LINE__ number suffix to make BTF_ID symbol more unique, which is not a complete fix, but it would help for now and meanwhile we can work on better solution as suggested by Andrii.
Cc: stable@vger.kernel.org Reported-by: Satya Durga Srinivasu Prabhala <quic_satyap@quicinc.com> Reported-by: Marcus Seyfarth <m.seyfarth@gmail.com> Closes: https://github.com/ClangBuiltLinux/linux/issues/1913 Debugged-by: Nathan Chancellor <nathan@kernel.org> Co-developed-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/bpf/CAEf4Bzb5KQ2_LmhN769ifMeSJaWfebccUasQOfQKaOd0nQ51tw@mail.gmail.com/ Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> --- tools/include/linux/btf_ids.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/include/linux/btf_ids.h b/tools/include/linux/btf_ids.h index 71e54b1e3796..2f882d5cb30f 100644 --- a/tools/include/linux/btf_ids.h +++ b/tools/include/linux/btf_ids.h @@ -38,7 +38,7 @@ asm( \ ____BTF_ID(symbol) #define __ID(prefix) \ - __PASTE(prefix, __COUNTER__) + __PASTE(__PASTE(prefix, __COUNTER__), __LINE__) /* * The BTF_ID defines unique symbol for each ID pointing -- 2.42.0.459.ge4e396fd5e-goog
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