linux-kernel - Re: [PATCH v8 10/10] tracing/hyper-v: trace hyperv_mmu_flush_tlb

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Message-ID: <20170609143208.69afd2e9@gandalf.local.home>
Date:   Fri, 9 Jun 2017 14:32:08 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        devel@...uxdriverproject.org, "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Jork Loeser <Jork.Loeser@...rosoft.com>,
        Simon Xiao <sixiao@...rosoft.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v8 10/10] tracing/hyper-v: trace
 hyperv_mmu_flush_tlb_others()

On Fri, 9 Jun 2017 21:23:52 +0300
Andy Shevchenko <andy.shevchenko@...il.com> wrote:

> On Fri, Jun 9, 2017 at 9:04 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > On Fri,  9 Jun 2017 15:27:36 +0200
> > Vitaly Kuznetsov <vkuznets@...hat.com> wrote:  
> 
> 
> >> +#if IS_ENABLED(CONFIG_HYPERV)  
> >
> > Hmm, this is new to me. I know you can use IS_ENABLED() inside C code,
> > but I've never seen it used for preprocessor directives. This usually
> > is just:
> >
> > #ifdef CONFIG_HYPERV
> >
> > Other than that, this looks fine to me.  
> 
> That is the magic of IS_ENABLED(), IS_BUILTIN() macros.
> So, the code above is fine as is.
> 

I'm sure it works, but it just adds one more way of doing the same
thing. I thought that was what perl was always criticized for, and why
people usually prefer python. Don't get me wrong, I prefer oysters over
snakes. But I just wanted to point out the lack of consistency here.

-- Steve