linux-kernel - [PATCH v3 0/2] Enable retpoline support only when compiler support

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Date:   Fri, 2 Nov 2018 01:45:40 -0700 (PDT)
From:   Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:     <linux-kernel@...r.kernel.org>
Cc:     <mingo@...hat.com>, <tglx@...utronix.de>, <dwmw@...zon.co.uk>,
        <srinivas.eeda@...cle.com>, <yamada.masahiro@...ionext.com>,
        <peterz@...radead.org>
Subject: [PATCH v3 0/2] Enable retpoline support only when compiler support

According to PeterZ'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.

-v3:
Add Suggested-by[Ingo]
Break build if compiler doesn't support retpoline[Dwmw,Tglx,Ingo]

-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                     |  4 ----
 arch/x86/Makefile                    |  5 +++--
 arch/x86/include/asm/nospec-branch.h | 12 ++++++------
 arch/x86/kernel/cpu/bugs.c           | 13 ++-----------
 scripts/Makefile.build               |  2 --
 5 files changed, 11 insertions(+), 25 deletions(-)

-- 
1.8.3.1