kallsyms: fix nonconverging kallsyms table with lld

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: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 7ecd2cc..54ad86d 100644 (file)
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -112,6 +112,12 @@ static bool is_ignored_symbol(const char *name, char type)
                "__crc_",               /* modversions */
                "__efistub_",           /* arm64 EFI stub namespace */
                "__kvm_nvhe_",          /* arm64 non-VHE KVM namespace */
+               "__AArch64ADRPThunk_",  /* arm64 lld */
+               "__ARMV5PILongThunk_",  /* arm lld */
+               "__ARMV7PILongThunk_",
+               "__ThumbV7PILongThunk_",
+               "__LA25Thunk_",         /* mips lld */
+               "__microLA25Thunk_",
                NULL
        };