Messages in this thread | | | From | Arvind Sankar <> | Date | Tue, 27 Oct 2020 16:32:10 -0400 | Subject | Re: [PATCH v6 13/29] arm64/build: Assert for unwanted sections |
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On Tue, Oct 27, 2020 at 01:28:02PM -0700, Nick Desaulniers wrote: > > commit 3193c0836f203a91bef96d88c64cccf0be090d9c > > Author: Josh Poimboeuf <jpoimboe@redhat.com> > > Date: Wed Jul 17 20:36:45 2019 -0500 > > > > bpf: Disable GCC -fgcse optimization for ___bpf_prog_run() > > > > has > > > > Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code") > > > > and mentions objtool and CONFIG_RETPOLINE. > > Thanks for the context. It might be time to revisit the above commit. > If I revert it (small conflict that's easy to fixup), > kernel/bpf/core.o builds cleanly with defconfig+GCC-9.3, so maybe > obtool did get smart enough to handle that case? Probably regresses > the performance of that main dispatch loop for BPF, but not sure what > folks are expecting when retpolines are enabled. > -- > Thanks, > ~Nick Desaulniers
The objtool issue was with RETPOLINE disabled.
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