objtool: Don't fail on missing symbol table · Pull Request !141 · openEuler/kernel

同步开源patch,解决openEuler-1.0-LTS编译报错的问题
  CC [M]  arch/x86/kvm/../../../virt/kvm/kvm_main.o
  AS      arch/x86/entry/thunk_64.o
  AS      certs/system_certificates.o
arch/x86/entry/.tmp_thunk_64.o: warning: objtool: missing symbol table
make[2]: *** [scripts/Makefile.build:403: arch/x86/entry/thunk_64.o] Error 1
make[1]: *** [scripts/Makefile.build:544: arch/x86/entry] Error 2
make[1]: *** Waiting for unfinished jobs....

objtool: Don't fail on missing symbol table

commit 1d489151e9f9d1647110277ff77282fe4d96d09b upstream.

Thanks to a recent binutils change which doesn't generate unused
    symbols, it's now possible for thunk_64.o be completely empty without
    CONFIG_PREEMPTION: no text, no data, no symbols.

We could edit the Makefile to only build that file when
    CONFIG_PREEMPTION is enabled, but that will likely create confusion
    if/when the thunks end up getting used by some other code again.

Just ignore it and move on.

Reported-by: Nathan Chancellor <natechancellor@gmail.com>
    Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
    Reviewed-by: Miroslav Benes <mbenes@suse.cz>
    Tested-by: Nathan Chancellor <natechancellor@gmail.com>
    Link: https://github.com/ClangBuiltLinux/linux/issues/1254
    Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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