From: Peter Zijlstra <peterz@infradead.org>
To: Yonghong Song <yhs@fb.com>
Cc: mingo@kernel.org, ast@fb.com, daniel@iogearbox.net,
linux-kernel@vger.kernel.org, x86@kernel.org, kernel-team@fb.com
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: <20180420081936.GD4064@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180415042738.1788215-1-yhs@fb.com>
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
general.
next prev 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 [PATCH v2] x86/cpufeature: guard asm_volatile_goto usage with NO_BPF_WORKAROUND 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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