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From: Peter Zijlstra <>
To: Yonghong Song <>
Subject: Re: [PATCH v2] x86/cpufeature: guard asm_volatile_goto usage with NO_BPF_WORKAROUND
Date: Fri, 20 Apr 2018 10:19:36 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Sat, Apr 14, 2018 at 09:27:38PM -0700, Yonghong Song wrote:

> This patch adds a preprocessor guard NO_BPF_WORKAROUND around the
> asm_volatile_goto based static_cpu_has(). NO_BPF_WORKAROUND is set
> at toplevel Makefile when compiler supports asm-goto. That is,
> if the compiler supports asm-goto, the kernel build will use
> asm-goto version of static_cpu_has().

Hurm, so adding __BPF__ for BPF compiles isn't an option? It seems to me
having a CPP flag to identify BPF compile context might be useful in

  parent reply	other threads:[~2018-04-20  8:19 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-15  4:27 Yonghong Song
2018-04-19 16:36 ` Yonghong Song
2018-04-20  8:19 ` Peter Zijlstra [this message]
2018-04-20 18:06   ` Yonghong Song
2018-04-23 10:52     ` Peter Zijlstra
2018-04-23 16:50       ` Yonghong Song
2018-04-27 16:34         ` Yonghong Song
2018-05-02 14:01           ` Yonghong Song

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