According to Peter Zijlstra's suggestion in https://lkml.org/lkml/2018/9/18/1016,
hard bind retpoline with compiler support and remove minimal stuff.
Tested with both CONFIG_RETPOLIN_SUPPORT enabled and disabled.
Zhenzhong Duan (3):
retpolines: Only enable retpoline when compiler support it
retpolines: Remove the minimal stuff of retpoline support
kprobes/x86: Simplify indirect-jump check in retpoline case
Documentation/admin-guide/kernel-parameters.txt | 2 +-
arch/x86/Kconfig | 8 ++++----
arch/x86/Makefile | 5 +++--
arch/x86/entry/vdso/Makefile | 4 ++--
arch/x86/include/asm/nospec-branch.h | 12 ++++++------
arch/x86/kernel/cpu/bugs.c | 13 ++-----------
arch/x86/kernel/kprobes/opt.c | 14 ++++++--------
arch/x86/kernel/vmlinux.lds.S | 2 +-
arch/x86/lib/Makefile | 2 +-
arch/x86/lib/retpoline.S | 2 ++
scripts/Makefile.build | 2 +-
11 files changed, 29 insertions(+), 37 deletions(-)
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1.8.3.1