tree b31fdb5b9e948e89c3909448d654251b28f21bd1
parent 5ee93551c703f8fa1a6c414a7d08f956de311df3
author Seth Forshee <seth.forshee@canonical.com> 1563379586 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1573381629 +0100

kbuild: add -fcf-protection=none when using retpoline flags

[ Upstream commit 29be86d7f9cb18df4123f309ac7857570513e8bc ]

The gcc -fcf-protection=branch option is not compatible with
-mindirect-branch=thunk-extern. The latter is used when
CONFIG_RETPOLINE is selected, and this will fail to build with
a gcc which has -fcf-protection=branch enabled by default. Adding
-fcf-protection=none when building with retpoline enabled
prevents such build failures.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>