linux-kernel - [PATCH] kbuild: lto: add _mcount to list of used symbols

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Message-Id: <20210225143456.3829513-1-arnd@kernel.org>
Date:   Thu, 25 Feb 2021 15:34:49 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] kbuild: lto: add _mcount to list of used symbols

From: Arnd Bergmann <arnd@...db.de>

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@...db.de>
---
 scripts/lto-used-symbollist.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/lto-used-symbollist.txt b/scripts/lto-used-symbollist.txt
index 38e7bb9ebaae..406ada65e926 100644
--- 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
-- 
2.29.2