[PATCH v2 0/2] 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_RETPOLINE enabled and disabled.

-v2:
Add compiler support check in Kconfig [Masahiro]
Drop 3rd patch as __insn_is_indirect_jump() may be used in some corner case.[PeterZ]

Zhenzhong Duan (2):
  retpolines: Only enable retpoline when compiler support it
  retpolines: Remove the minimal stuff of retpoline support

 arch/x86/Kconfig                     |  6 ++----
 arch/x86/Makefile                    |  4 +---
 arch/x86/include/asm/nospec-branch.h | 12 ++++++------
 arch/x86/kernel/cpu/bugs.c           | 13 ++-----------
 scripts/Makefile.build               |  2 --
 5 files changed, 11 insertions(+), 26 deletions(-)

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1.8.3.1