linux-kernel - [PATCH v2 00/10] objtool validation of static branches and retpoline

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Message-Id: <20180116142825.376986833@infradead.org>
Date:   Tue, 16 Jan 2018 15:28:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Woodhouse <dwmw2@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v2 00/10] objtool validation of static branches and retpoline

Because dwmw2 is a wee bit paranoid and GCC has a history of being slightly
retarded at times; here are a few patches that validate it will in fact
generate sensible code for static branches.

Also, per dwmw2's request, code to validate retpoline code does not include
dynamic jump or calls.

---
 arch/x86/include/asm/alternative-asm.h |   3 +-
 arch/x86/include/asm/alternative.h     |   7 +-
 arch/x86/include/asm/cpufeature.h      |  82 ++++++------
 arch/x86/include/asm/jump_label.h      |  23 ++++
 arch/x86/kernel/head_64.S              |   5 +-
 scripts/Makefile.build                 |   4 +
 tools/objtool/builtin-check.c          |   5 +-
 tools/objtool/builtin-orc.c            |   4 +-
 tools/objtool/check.c                  | 223 +++++++++++++++++++++++++++++++--
 tools/objtool/check.h                  |   3 +-
 tools/objtool/special.c                |  13 +-
 tools/objtool/special.h                |   1 +
 12 files changed, 318 insertions(+), 55 deletions(-)