linux-kernel - Re: [PATCH v2 06/19] asm-generic/barrier: mask speculative execution flows

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Message-ID: <20180115084611.GK6176@hirez.programming.kicks-ass.net>
Date:   Mon, 15 Jan 2018 09:46:11 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        Catalin Marinas <catalin.marinas@....com>,
        X86 ML <x86@...nel.org>, Will Deacon <will.deacon@....com>,
        Alexei Starovoitov <ast@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH v2 06/19] asm-generic/barrier: mask speculative execution
 flows

On Fri, Jan 12, 2018 at 04:41:37PM -0800, Dan Williams wrote:
> This certainly needs a Kconfig "depends on JUMP_LABEL" to turn on the
> dynamic switching at all, and a HAVE_JUMP_LABEL compile time failure
> if the compiler lacks support.

We're ready to drop all compilers that don't support asm-goto on the
floor for x86. So don't over engineer it just to avoid that.