linux-kernel - Re: [PATCH] x86/cpufeature: guard asm_volatile_goto usage with CC_HAVE_ASM

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Message-ID: <20180413181924.GT4064@hirez.programming.kicks-ass.net>
Date:   Fri, 13 Apr 2018 20:19:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexei Starovoitov <ast@...com>
Cc:     Yonghong Song <yhs@...com>, mingo@...nel.org, daniel@...earbox.net,
        linux-kernel@...r.kernel.org, x86@...nel.org, kernel-team@...com,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/cpufeature: guard asm_volatile_goto usage with
 CC_HAVE_ASM_GOTO

On Tue, Apr 10, 2018 at 02:28:04PM -0700, Alexei Starovoitov wrote:
> Instead of
> #ifdef CC_HAVE_ASM_GOTO
> we can replace it with
> #ifndef __BPF__
> or some other name,

I would prefer the BPF specific hack; otherwise we might be encouraging
people to build the kernel proper without asm-goto.