[PATCH 0/3] Enable retpoline only when compiler support

[Zhenzhong Duan]

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