kbuild: lto: add _mcount to list of used symbols

Some randconfig builds fail with undefined references to _mcount
when CONFIG_TRIM_UNUSED_KSYMS is set:

ERROR: modpost: "_mcount" [drivers/tee/optee/optee.ko] undefined!
ERROR: modpost: "_mcount" [drivers/fsi/fsi-occ.ko] undefined!
ERROR: modpost: "_mcount" [drivers/fpga/dfl-pci.ko] undefined!

Since there is already a list of symbols that get generated at link
time, add this one as well.

Fixes: fbe078d397b4 ("kbuild: lto: add a default list of used symbols")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

diff --git a/scripts/lto-used-symbollist.txt b/scripts/lto-used-symbollist.txt
index 38e7bb9ebaae8d62d57ab92c23dc596182d90b0b..406ada65e9265c6da837146c5ceeb147673388a2 100644 (file)
--- a/scripts/lto-used-symbollist.txt
+++ b/scripts/lto-used-symbollist.txt
@@ -1,5 +1,6 @@
 memcpy
 memmove
 memset
+_mcount
 __stack_chk_fail
 __stack_chk_guard