• Arnd Bergmann's avatar
    kallsyms: fix nonconverging kallsyms table with lld · efe6e306
    Arnd Bergmann authored
    ARM randconfig builds with lld sometimes show a build failure
    from kallsyms:
    
      Inconsistent kallsyms data
      Try make KALLSYMS_EXTRA_PASS=1 as a workaround
    
    The problem is the veneers/thunks getting added by the linker extend
    the symbol table, which in turn leads to more veneers being needed,
    so it may take a few extra iterations to converge.
    
    This bug has been fixed multiple times before, but comes back every time
    a new symbol name is used. lld uses a different set of identifiers from
    ld.bfd, so the additional ones need to be added as well.
    
    I looked through the sources and found that arm64 and mips define similar
    prefixes, so I'm adding those as well, aside from the ones I observed. I'm
    not sure about powerpc64, which seems to already be handled through a
    section match, but if it comes back, the "__long_branch_" and "__plt_"
    prefixes would have to get added as well.
    Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
    efe6e306
kallsyms.c 18.1 KB