From: Peter Zijlstra <peterz@infradead.org>
To: Alexei Starovoitov <ast@fb.com>
Cc: Yonghong Song <yhs@fb.com>,
mingo@kernel.org, daniel@iogearbox.net,
linux-kernel@vger.kernel.org, x86@kernel.org, kernel-team@fb.com,
Thomas Gleixner <tglx@linutronix.de>,
netdev <netdev@vger.kernel.org>,
Jesper Dangaard Brouer <brouer@redhat.com>
Subject: Re: [PATCH] x86/cpufeature: guard asm_volatile_goto usage with CC_HAVE_ASM_GOTO
Date: Sat, 14 Apr 2018 12:11:12 +0200 [thread overview]
Message-ID: <20180414101112.GX4064@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <a65f6542-8754-ea84-d1bf-076349b6b288@fb.com>
On Fri, Apr 13, 2018 at 01:42:14PM -0700, Alexei Starovoitov wrote:
> On 4/13/18 11:19 AM, Peter Zijlstra wrote:
> > 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.
> >
>
> I don't understand this concern.
The thing is; this will be a (temporary) BPF specific hack. Hiding it
behind something that looks 'normal' (CC_HAVE_ASM_GOTO) is just not
right.
next prev parent reply other threads:[~2018-04-14 10:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-10 20:42 [PATCH] x86/cpufeature: guard asm_volatile_goto usage with CC_HAVE_ASM_GOTO Yonghong Song
2018-04-10 21:07 ` Peter Zijlstra
2018-04-10 21:28 ` Alexei Starovoitov
2018-04-13 18:19 ` Peter Zijlstra
2018-04-13 20:42 ` Alexei Starovoitov
2018-04-14 10:11 ` Peter Zijlstra [this message]
2018-04-14 20:30 ` Yonghong Song
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