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.
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